A new biomedical robot measuring just 0.95 millimeters (roughly 0.04 inches) in diameter has captured attention across the medical community. It is 60 percent smaller than similar instruments currently in use and promises more precise, minimally invasive surgery.



The tiny device has been developed at the School of Engineering of the Hong Kong University of Science and Technology <a href="https://seng.hkust.edu.hk/" target="_blank" rel="noreferrer noopener">(HKUST)</a>. The research team was led by Yajing Shen, an associate professor in the Department of Electronic and Computer Engineering.



The scientists tackled the challenge of creating a tool that combines ultra-compact size with fine-tuned navigation and various therapeutic functions.



<h2 class="wp-block-heading" id="h-smaller-robot-with-fewer-surgery-risks">Smaller robot with fewer surgery risks</h2>



The mini-robot can traverse tiny corridors, including those found in the <a href="https://www.earth.com/news/how-the-covid-19-virus-travels-deep-inside-our-lungs/">bronchi of the lungs</a> and the fallopian tubes. Physicians often struggle to deliver interventions in these slender regions, so this petite structure could expand diagnostic and therapeutic possibilities significantly.



It performs tasks such as laser ablation, tissue sampling, and drug delivery at the exact sites that need attention. Researchers see this as a potential method to reduce surgical damage and accelerate patient recovery.



Experts in robotics emphasize that smaller instruments pose fewer risks of injuring sensitive tissues. Delicate pathways can then be probed without large incisions or cumbersome endoscopes that obscure surgical views.



Such a shift could improve doctors’ ability to treat conditions early, particularly in organs with branching passages. <a href="https://www.earth.com/news/new-robot-could-revolutionize-breast-cancer-diagnosis/" target="_blank" rel="noreferrer noopener">Early access</a> often means swift actions and better treatment outcomes.



<h2 class="wp-block-heading" id="h-tiny-yet-powerful-robot">Tiny yet powerful robot</h2>



This ultra-compact surgical robot features multiple advanced components that work together in one tight layout. An optical fiber assembly captures images, while a microscopic 3D printing process produces a hollow skeleton that holds fibers and tools.



The engineers have coated it using a special magnetic spray technique, such that a functionalized skin is formed. This allows magnetic steering from outside the patient, which gives physicians a non-invasive way to guide the device.



A thin, gel layer covers the exterior to decrease friction and ensure smooth travel of the robot through winding channels. All of these steps aim to keep the robot tiny yet powerful.



At less than 0.04 inches across, it fits into places that many clinicians have never been able to reach with standard instruments, thus addressing a longstanding problem in surgical technology.



<h2 class="wp-block-heading" id="h-endoscopic-images-and-surgical-precision">Endoscopic images and surgical precision</h2>



In addition to its petite form, the <a href="https://www.nature.com/articles/s41467-024-55199-6" target="_blank" rel="noreferrer noopener">device</a> achieves approximately 30 micrometers of positional accuracy. This level of control helps surgeons target precise spots without straying into surrounding tissues.



Along with its accuracy, the robot detects blockages at distances up to about 9.4 millimeters (0.37 inches). This figure is roughly a tenfold increase over older endoscopic robots, which often fell short when navigating or scanning for obstructions.



In addition, a broad field of view - around 25 times larger than some conventional systems - lets doctors gather detailed images from a single vantage point. This is particularly useful in branching areas where strong visual feedback is needed to prevent collisions or misplacements.



Such imaging and obstacle detection capacities are crucial when weaving through body structures that branch unpredictably. Enhanced awareness can give physicians more confidence in exploring these obscure regions.



<h2 class="wp-block-heading" id="h-lab-evaluations-and-real-tissue-tests">Lab evaluations and real tissue tests</h2>



The researchers assessed the robot in <a href="https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/in-vitro-studies#:~:text=In%20vitro%20studies%20in%20experimental,From%3A%20Animal%20Biotechnology%2C%202014" target="_blank" rel="noreferrer noopener">in vitro studies</a> of <a href="https://pubmed.ncbi.nlm.nih.gov/34547790/" target="_blank" rel="noreferrer noopener">bronchial networks</a>, and confirmed smooth motion control. They then tested it on extracted pig lungs, and found it could gather images and perform minor treatments where standard scopes struggle.



“Small-scale continuum robots hold promise for interventional diagnosis and treatment, yet existing models often struggle with compactness, precise navigation, and visualized functional treatment all in one,” said Professor Shen.



<h2 class="wp-block-heading" id="h-opportunities-for-specialized-treatments">Opportunities for specialized treatments</h2>



<a href="https://www.earth.com/news/new-blood-test-diagnoses-heart-attacks-in-minutes-not-hours/">Early detection</a> often means better outcomes for patients. By traveling into narrow organ branches, doctors might detect infections, tumors, or other anomalies that were previously difficult to reach.



With local drug delivery, the therapy remains concentrated in the area of the target, thus sparing the rest of the body from unnecessary exposure. Such specificity may reduce medication dosages and side effects.



<h2 class="wp-block-heading" id="h-reducing-surgical-burdens">Reducing surgical burdens</h2>



Smaller incisions generally mean less pain, lower infection risk, and quicker healing. The robot could decrease surgery trauma by limiting how much tissue is moved or cut.



Once inside, it can complete multiple tasks in one session, limiting the need for additional procedures. This efficiency could save time for patients and clinics alike.



<h2 class="wp-block-heading" id="h-path-to-clinical-acceptance">Path to clinical acceptance</h2>



The research team hopes to conduct <a href="https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/in-vivo-studies" target="_blank" rel="noreferrer noopener">in vivo studies</a> next. They aim to confirm whether the robot can navigate real physiological conditions with the same level of agility.



“We aim to further optimize the design and control of the fiberscopic robot, prioritizing safety and reliability during interventional surgery,” said Dr. Zhang Tieshan, a postdoctoral fellow at HKUST. 



Fine-tuning the technology will help doctors integrate it seamlessly into everyday practice.



<h2 class="wp-block-heading" id="h-testing-the-robot-for-surgery">Testing the robot for surgery</h2>



In the long-term, experts predict that more integrated features could be added, such as advanced imaging modes, automated motion guidance and specialized accessories. 



These extra elements could expand the range of possible interventions without increasing the robot's size.



Any improvements would, however, have to undergo careful testing to confirm they are <a href="https://www.earth.com/news/nanotech-material-graphene-passes-human-safety-tests/">safe for human use</a>.



Progress in material science and software development could also improve durability, navigation algorithms, and data processing. If tests results match the early promise, hospitals may adopt these tools to enhance their standards of care.



The study is published in <a href="https://www.nature.com/articles/s41467-024-55199-6" target="_blank" rel="noreferrer noopener">Nature Communications</a>.



-----



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World's smallest robot could transform minimally invasive surgery

A new biomedical robot measuring just 0.95 millimeters (roughly 0.04 inches) in diameter has captured attention across the medical community. It is 60 percent smaller than similar instruments currently in use and promises more precise, minimally invasive surgery. The tiny device has been developed at the School of Engineering of the Hong Kong University of Science and Technology (HKUST). The research team was led by Yajing Shen, an associate professor in the Department of Electronic and Computer Engineering. The scientists tackled the challenge of creating a tool...

Loss of megaherbivores such as elephants and hippos can allow woody plants and non-grassy herbs and flowering plants to encroach on grasslands in African national parks, according to a new University of Utah study, published Sept. 12 in Scientific Reports. The study used isotopes in hippopotamus teeth to find a shift in the diet of hippos over the course of a decade in Uganda's Queen Elizabeth National Park following widespread elephant poaching in the 1970s.

Study first author and U postdoctoral scholar Kendra Chritz says that her method of using hippo enamel isotopes could help scientists reconstruct past changes in vegetation in Africa's national parks, areas with relatively little ongoing scientific observation. The results could give ecologists an idea of what could happen to Africa's grasslands if elephants, whose populations are steeply declining, went extinct or reached near-extinction.

"We have a window into what these environments could look like without megaherbivores, and it's kind of grim," Chritz says.

Competing plant classes

[caption id="attachment_87372" align="alignleft" width="150"]<img class="size-thumbnail wp-image-87372" src="http://www.earth.com/wp-content/uploads/2016/09/africa-grasslands-zebra_1big_stock-150x150.jpg" alt="Zebra on African grasslands" width="150" height="150" /> Zebra on African grasslands[/caption]

Grasslands are an important ecosystem in Africa, hosting many animals and serving as corridors for wildlife movement. Lowland tropical grasses, such as those in elephant ecosystems, are part of the C4 class of plants, a reference to the enzyme used to process carbon dioxide into sugars during photosynthesis. Corn and sugarcane are also C4 plants. C3 plants, which use a different enzyme, include trees, shrubs, flowering plants and herbs. C3 plants compete for resources with C4 grasses in African savannas, including sunlight. Elephants and other megaherbivores help keep woody plant encroachment in check by browsing seasonally on shrubs and trees. But without that herbivore control, C3 plants can advance on grasslands unimpeded.

The presence of shrubs and trees, which can be seen in aerial photographs, give only a partial picture of the balance of power between C3 and C4 plants. Observing herbs and flowering plants requires ground-level observation, and records of such observations in Uganda's Queen Elizabeth National Park, and many national parks in Africa, is sparse.

The two plant groups' metabolic processes treat isotopes of carbon differently, so that C4 plants have a higher proportion of heavy carbon isotopes than C3 plants. As animals, such as hippos, eat plants, and the isotopic signatures of the plants in their diet are incorporated into the animals' bodies and preserved in durable tissue, such as teeth. The hippos of Queen Elizabeth National Park, Chritz found, had been indirectly "observing" the plant makeup of the grasslands all along.

Ecological crisis in Queen Elizabeth

Queen Elizabeth National Park sits on the border between Uganda and the Democratic Republic of the Congo, and covers the channel that connects two lakes. In 1971, Idi Amin became president of Uganda, and management of the national parks essentially ceased. The Ugandan military killed thousands of elephants between 1971 and the mid-1980s, both to sell ivory to fund the regime and as food. Aggressive poaching continued after Amin's ouster, and by the mid-80s the park's elephant population had dropped from more than four thousand down to around 150. Around 4,000 hippos were poached as well.

Studies showed increased areas of woody plants in the park once management resumed in the 1990s. Because the change happened over a span of a few decades, Queen Elizabeth National Park was an ideal ecosystem in which to test whether herbivore teeth could represent the shift from C4 to C3 plants.

Getting and testing the teeth

[caption id="attachment_87369" align="alignleft" width="150"]<img class="size-thumbnail wp-image-87369" src="http://www.earth.com/wp-content/uploads/2016/09/scientist-kendra-chritz-hippo-teeth_1big_UUtah-150x150.jpg" alt="Kendra Chritz sampling hippo enamel by kerosene lamplight in Uganda." width="150" height="150" /> Kendra Chritz sampling hippo enamel by kerosene lamplight in Uganda.[/caption]

Hippo teeth are not easy to come by, Chritz says. The teeth haven't been used before for isotope analysis due to the difficulty of obtaining samples from a wide range of time periods. One of Chritz's co-authors, Hans Klingel of Universitaet Braunschweig in Germany, conducted important research on the behavior of hippos in Queen Elizabeth National Park in the 1980s and 90s. He contributed teeth from the 1960s, pre-poaching, and from 2000. Chritz and her colleagues sampled enamel every centimeter along the length of each tooth, using known growth rates to correlate sections of the tooth to different years. All of these samples taken together recorded diet history from approximately the last decade of the animal's life. But analysis showed that the two teeth displayed very different isotopic signatures. Chritz needed a third sample, in between the two time periods.

While in Uganda in 2013, Chritz approached the current game warden about obtaining another hippo tooth. The warden showed her a skeleton on display at a park museum from a hippo that died in 1991 - perfectly within the time range Chritz had aimed for. (Hear more about the retrieval of the tooth and about sampling it in adverse conditions in the attached sound file).

Results showed that the 1960s hippo ate approximately 80 percent C4 plants, and that the percentage of C4 in the later hippos' diets had dropped to around 65 percent. This showed that, within a time scale of only a few decades, C3 plant encroachment had progressed enough to significantly impact the diets of the animals in the park. The results also showed the validity of Chritz's method and reconstructed the progression of vegetation changes since the 1960s.

Another surprise in the results was the proportion of C3 plants in the later hippos' diets. Initial studies of hippo diets surmised that hippos only ate grass. "And few researchers have suggested otherwise," Chritz says. "It appears that they're actually quite flexible in their diets and adaptable to environmental change."

Restoring grasslands

The clear implication from Chritz's work is that the loss of elephants and other megaherbivores can lead to rapid environmental and ecological change. "We've built a record that shows just how drastic the loss of megaherbivores in a park can be on a very short timescale," she says. "Within ten years, we see a big change in what's happening in this once diverse grassy area of the park. This is a window into the future of what could to happen in East African savannas as elephants continue to be poached at the currently unprecedented rate."

Chritz is hopeful that restoring elephant populations could reverse the changes and cause the grasslands to re-emerge. "But when you have too many elephants, they can also decimate forests by over-browsing," she says. "There's a balance you have to reach. The most important thing right now is to work hard at fighting poaching."

People can combat poaching by reducing the demand and financial incentive for harvesting the elephants' tusks, Chritz says. "Not purchasing ivory and knowing which products you might use that are made from ivory is the best thing you can do to protect elephants."

Hippopotamus teeth reveal clues about past environmental changes

Loss of megaherbivores such as elephants and hippos can allow...

From skeletal remains found among ancient owl pellets, a team of scientists has recovered the first ancient DNA of the extinct West Indian mammal Nesophontes, meaning "island murder." They traced its evolutionary history back to the dawn of mammals 70 million years ago.

The authors, including Selina Brace, Jessica Thomas, Ian Barnes et al., published their findings in the advanced online edition of Molecular Biology and Evolution.

The insect-eating creature existed in the Caribbean islands until the 16th century when, perhaps, they were outcompeted as the first Spanish ships arrived---introducing rats as stowaways. "Nesophontes was just one of the dozens of mammals that went extinct in the Caribbean during recent times," said Professor Ian Barnes, Research Leader at London's Natural History Museum.

Scientists used a 750-year-old specimen to generate many thousands of base pairs of DNA sequence data. This allowed the research team to uncover its evolutionary origins and finally resolve the relationships between its closest relatives, the insectivores, a group including shrews, hedgehogs and moles. Phylogenetic and divergence time scenarios clearly demonstrate that Nesophontes is a deeply distinct sister group to another group of living native Caribbean insectivores, the solenodons. The time of the split between these two correlates with an era when the northern Caribbean was formed of volcanic islands, well before the origins of the islands we see today.

Obtaining DNA from tropical fossils is notoriously difficult, and the team made use of the latest developments in ancient DNA technology to conduct the study.

"Once we'd dealt with the tiny size of the bone samples, the highly degraded state of the DNA, and the lack of any similar genomes to compare to, the analysis was a piece of cake," said Natural History Museum scientist Dr. Selina Brace.

The findings will be of considerable interest for evolutionary biologists studying mammalian biogeography, and the significant role that humans may have played in a recent extinction.

--

<a href="http://www.ox.ac.uk" target="_blank" rel="noopener">Oxford University</a>

Extinct mammal Nesophontes originated over 70 million years ago

From skeletal remains found among ancient owl pellets, a team...

Household dust exposes people to a wide range of toxic chemicals from everyday products, according to a study led by researchers at Milken Institute School of Public Health (Milken Institute SPH) at the George Washington University. The multi-institutional team conducted a first-of-a-kind meta-analysis, compiling data from dust samples collected throughout the United States to identify the top ten toxic chemicals commonly found in dust. They found that DEHP, a chemical belonging to a hazardous class called phthalates, was number one on that list. In addition, the researchers found that phthalates overall were found at the highest levels in dust followed by phenols and flame retardant chemicals.

"Our study is the first comprehensive analysis of consumer product chemicals found in household dust," says lead author Ami Zota, ScD, MS, assistant professor of environmental and occupational health at Milken Institute SPH. "The findings suggest that people, and especially children, are exposed on a daily basis to multiple chemicals in dust that are linked to serious health problems."

Chemicals from consumer products are released into the air and get into dust, which can settle on household items or on the floor. People can inhale or ingest small particles of dust or even absorb them through the skin. Infants and young children are particularly at risk for exposure to the chemicals found in dust because they crawl, play on dusty floors, and put their hands in their mouths, the authors say.

Zota and colleagues pooled data from 26 peer-reviewed papers and one unpublished dataset that analyzed dust samples taken from homes in 14 states. They found 45 potentially toxic chemicals that are used in many consumer and household products such as vinyl flooring, personal care and cleaning products, building materials and home furnishings. The meta-analysis combines information from smaller dust studies and thus offers solid conclusions with greater statistical power, the authors say.

The team found that:
<ul>
 	<li>Ten harmful chemicals are found in ninety percent of the dust samples across multiple studies, including a known cancer-causing agent called TDCIPP. This flame retardant is frequently found in furniture, baby products and other household items.</li>
 	<li>Indoor dust consistently contains four classes of harmful chemicals in high amounts. Phthalates, substances that are used to make cosmetics, toys, vinyl flooring, and other products, were found in the highest concentration with a mean of 7,682 nanograms per gram of dust-an amount that was several orders of magnitude above the others. Phenols, chemicals used in cleaning products and other household items, were the number two highest chemical class followed by flame retardants and highly fluorinated chemicals used to make non-stick cookware.</li>
 	<li>Chemicals from dust are likely to get into young children's bodies. A flame retardant added to couches, baby products, electronics and other products, TCEP, had the highest estimated intake followed by four phthalates--DEP, DEHP, BBzP and DnBP. The intake numbers in this study probably underestimate the true exposure to such chemicals, which are also found in products on the drug store shelf and even in fast food the authors say.</li>
 	<li>Phthalates such as DEP, DEHP, DNBP, and DIBP, are not only found at the highest concentrations in dust but are associated with many serious health hazards. Phthalates are thought to interfere with hormones in the body and are linked to a wide range of health issues including declines in IQ and respiratory problems in children.</li>
 	<li>Highly fluorinated chemicals such as PFOA and PFOS are also high on the potential harm scale. These types of chemicals, which are found in cell phones, pizza boxes, and many non-stick, waterproof and stain-resistant products have been linked to numerous health problems of the immune, digestive, developmental and endocrine systems.</li>
 	<li>Small amounts can add up. Many of the chemicals in dust are linked to the same health hazards, such as cancer or developmental and reproductive toxicity, and may be acting together. Exposure to even small amounts of chemicals in combination can lead to an amplified health risk, especially for developing infants or young children, the authors say.</li>
</ul>
"The number and levels of toxic and untested chemicals that are likely in every one of our living rooms was shocking to me," said co-author Veena Singla, PhD, staff scientist at the Natural Resources Defense Council. "Harmful chemicals used in everyday products and building materials result in widespread contamination of our homes--these dangerous chemicals should be replaced with safer alternatives," Singla adds.

In the meantime, consumers who want to reduce their exposure to chemicals in household dust and the environment around them can take a few simple steps such as keeping dust levels low by using a strong vacuum with a HEPA filter; washing hands frequently; and avoiding personal care and household products that contain potentially dangerous chemicals.

"Consumers have the power to make healthier choices and protect themselves from harmful chemicals in everyday products," says Robin Dodson, an environmental exposure scientist at Silent Spring Institute. "These things can make a real difference not only in their health but also in shifting the market toward safer products."
###
The meta-analysis, "Consumer product chemicals in indoor dust: a quantitative meta-analysis of U.S. studies," will be published September 14 in the journal Environmental Science &amp; Technology. In addition to Zota, Dodson, and Singla the team included Susanna Mitro and Angelo Elmi at Milken Institute SPH as well as scientists from the Harvard T.H. Chan School of Public Health and the University of California, San Francisco. Funding for the study was provided by the Natural Resources Defense Council, the National Institute of Environmental Health Sciences and the U.S. Department of Housing and Urban Development.

About Milken Institute School of Public Health at the George Washington University: Established in July 1997 as the School of Public Health and Health Services, Milken Institute School of Public Health is the only school of public health in the nation's capital. Today, more than 1,900 students from 54 U.S. states and territories and more than 50 countries pursue undergraduate, graduate and doctoral-level degrees in public health. The school also offers an online Master of Public Health, MPH@GW, and an online Executive Master of Health Administration, MHA@GW, which allow students to pursue their degree from anywhere in the world.

About the Natural Resources Defense Council

The Natural Resources Defense Council (NRDC) is an international nonprofit environmental organization with more than 2 million members and online activists. Since 1970, our lawyers, scientists, and other environmental specialists have worked to protect the world's natural resources, public health, and the environment. NRDC has offices in New York City, Washington, D.C., Los Angeles, San Francisco, Chicago, Bozeman, MT, and Beijing. Visit us at<a href="http://www.nrdc.org/" target="_blank" rel="noopener">http://www.nrdc.org</a> and follow us on Twitter <a href="https://twitter.com/NRDC">@NRDC</a>.

Harmful chemicals are found in household dust

Household dust exposes people to a wide range of toxic...

The deaths of many thousands of elephants at the hands of poachers in recent years has led some to conclude that the ivory ban established in 1989 should be lifted, allowing for tight regulation of the ivory trade. But, according to a new analysis reported in the Cell Press journal Current Biology on September 15, there is no way to sustainably harvest ivory. The demand is far too great.

"We simply can't lift the ivory ban," says David Lusseau of the University of Aberdeen in the United Kingdom. "Doing so would have catastrophic consequences for elephant populations across Africa, even those currently well protected in Southern Africa."

"But," he adds, "we must also acknowledge that poaching is not going away, and we need mechanisms to address the anticipation of trade which is created every time there is a regional sale of stockpiles or a significant outcry against the trade ban."

Prompted by the fact that <a href="https://cites.org/" target="_blank" rel="noopener">CITES</a> is now considering the possibility of a legal ivory trade, Lusseau and colleague Phyllis Lee of the University of Stirling, United Kingdom, set out to produce a realistic model defining how much ivory could be sustainably harvested from elephant populations.

"Before we can even consider whether we should lift the existing ban on trade in ivory, we need to figure out how much ivory a population of elephants can produce in a sustainable manner," Lee explains.

Existing models treat each individual as "average," meaning that they supply an average amount of ivory, she explains. The trouble is that this isn't the way it works. In reality, some elephants supply much greater volumes of ivory than others. Males produce more ivory than females. The amount of ivory also tends to increase as an elephant ages.

According to the researchers' calculations, the sustainability space for harvesting ivory is incredibly small. Out of a reference population of 1,360 elephants, only 100 to 150 kilograms (about 220 to 330 pounds) of ivory could be harvested--a level well below the current demand.

This means that to maintain a healthy, well-protected, and growing population, "we could take roughly one big male every year," Lusseau says. Then consider that a big male might be 45 to 55 years old. It would take a very long time--two to three generations--to replace those big ivory-bearing males once they were lost.

"Once you take the big males out, you then need to take several smaller animals to harvest the same amount of ivory the next year; and so on," Lee adds.

And, it gets worse when you consider the insatiable demand for ivory. If only one old male per 1,500 elephants can be harvested sustainably, "then there is simply no way to meet current demand," Lusseau says.

The only solution then, they say, is to manage the demand for ivory more effectively. That can't be achieved by selling off stockpiles of ivory, either.

"Sales of ivory have been promoted as a source of revenue that could be used for elephant conservation and as a means to satisfy--and thus reduce--demand for ivory, but the opposite has occurred," Lee says. "Poaching has increased! There is no evidence that revenue from past ivory sales made any significant impact on protecting elephant populations in any African country. In fact, the main consequence of prior sales has been to give the impression to consumers that the ivory trade has been, or will be legalized, leading to spiralling demand and greater poaching."

Instead, the researchers recommend efforts to develop alternative sources of income for those living with elephants. They say it's also critical to change people's perceptions about buying products containing ivory. "We must show that there is more value to have a live elephant than an ivory ashtray," Lusseau says.

The findings come just days before the CITES World Wildlife Conference to be held in Johannesburg. Lusseau says that it is now vital that CITES sends a "clear signal to poachers, traders, and consumers that the ivory trade is 'closed.' Then work can focus on halting the illegal trade, curbing demand, and protecting elephants and their habitats."

Lusseau and Lee say that they will continue to improve upon their model by adding in environmental and other factors. They also intend to build on the model to develop a more thorough understanding of the socioeconomic drivers behind the ivory supply chain.
###
Current Biology, Lusseau and Lee: "Can We Sustainably Harvest Ivory?"<a href="http://www.cell.com/current-biology/fulltext/S0960-9822(16)31005-3" target="_blank" rel="noopener">http://www.cell.com/current-biology/fulltext/S0960-9822(16)31005-3</a>

Study: Lifting ivory ban won't save elephants

The deaths of many thousands of elephants at the hands...

Mosquitoes are more likely to feed on cattle than on humans if they carry a specific chromosomal rearrangement in their genome. This reduces their odds of transmitting the malaria parasite, according to a University of California, Davis, study published Sept. 15 in the journal PLOS Genetics.

Rates of malaria transmission depend on whether mosquitos bite humans or animals, and whether they rest after that meal in an area where they will encounter pesticides.

Bradley Main, a researcher in the Vector Genetics Lab at the UC Davis School of Veterinary Medicine, and his colleagues investigated whether there is a genetic basis to host choice and resting behavior in Anopheles arabiensis. That species of mosquito has become the primary vector of malaria in east Africa due to its broader host range and the frequent use of pesticide-treated bed nets, which kill other species that live closely with humans.

"Whether there is a genetic basis to feeding preferences in mosquitoes has long been debated," Main said. "Using a population genomics approach, we have established an association between human feeding and a specific chromosomal rearrangement in the major east African malaria vector. This work paves the way for identifying specific genes that affect this critically important trait."

Using Genetics to Help Stop Malaria's Spread

Using genetics to better understand and track mosquito behavior can improve local control strategies. This knowledge may also open novel avenues for stopping malaria's spread, such as genetically modifying mosquitos to prefer cattle over people.

The researchers sequenced the genomes of 23 human-fed and 25 cattle-fed mosquitoes collected indoors and outdoors from the Kilobero Valley in Tanzania. They identified a genetic component that contributes to the mosquito's host choice but not its choice of resting place.

They narrowed down the gene region associated with cattle feeding to a chromosomal rearrangement called the 3Ra inversion.

The study is the first to use genomic tools to find a genetic basis for earlier observations that inversions can be linked to a preference for cattle in mosquitoes.

While the findings provide strong support that the inversion in An. arabiensis is linked to cattle feeding, researchers need to test a larger geographic area to confirm the connection.
###
The study was funded by the National Institutes of Health.

The study will be available at <a href="http://dx.plos.org/10.1371/journal.pgen.1006303" target="_blank">http://dx.plos.org/10.1371/journal.pgen.1006303</a>

Why do mosquitoes prefer humans over animals?

Mosquitoes are more likely to feed on cattle than on...

At least 20 countries are expected to formally join the Paris Agreement on climate change this week, greatly improving the pact's chances of coming into force just a year after it was negotiated in the French capital, U.N. officials say.
That's considered a blistering pace in the world of international diplomacy, reflecting a sense of urgency in the fight against global warming and a desire to seal the deal before the Obama administration leaves office.
Brazil, Mexico, Argentina and Morocco are expected to hand over documents at the U.N. in New York on Wednesday to formally complete the ratification process. At least half a dozen small island nations including Papua New Guinea, Tonga and Kiribati will also follow suit.
"We are ready. We will announce it in New York," Moroccan Environment Minister Hakima el-Haite told The Associated Press.
After years of negotiations, governments agreed in Paris last December to curb the emissions of carbon dioxide and other greenhouse gases that scientists say are warming the planet.
More than 170 world leaders have signed the deal, but it won't take effect until 55 countries accounting for at least 55 percent of global emissions have ratified or accepted it through their domestic procedures. That was initially expected to take several years, but 28 countries accounting for 39 percent of emissions are already done, including China and the United States, the world's top two greenhouse gas emitters.
U.S. diplomats are now pushing other countries to accelerate their ratification efforts so that the deal can enter into force this year. The White House says President Barack Obama and Secretary of State John Kerry plan to corner foreign leaders in the hallways during the U.N. gathering to personally pressure them to join this week.
"We're very anxious to have it move forward quickly," U.S. climate envoy Jonathan Pershing told the AP. "We are talking to everybody about the urgency."
It's possible that more than 55 countries will have joined by the end of Wednesday. It will likely take a bit longer to reach 55 percent of world emissions.
Pershing said the haste comes down to the fact that "this is a problem that can't wait."
Others say another factor is the potential of a shift in U.S. climate policy depending on the outcome of the presidential election in November. Democratic Party candidate Hillary Clinton has said the U.S. must implement the Paris Agreement, but Republican candidate Donald Trump has said he will cancel the deal.
"The Obama administration clearly would like to see this done before they leave office," said Alden Meyer, a veteran observer of the U.N. climate talks at the Union of Concerned Scientists.
"That doesn't guarantee that the next president will fully implement Paris," Meyer said. "But it would take at least four years for the U.S. to formally withdraw."
The Paris Agreement asks both rich and poor countries to take action to curb the rise in global temperatures that is melting glaciers, raising sea levels and shifting rainfall patterns across the globe. It requires governments to present national plans to reduce emissions, though the targets themselves aren't internationally binding.
The European Union, which considers itself as one of the architects of the Paris deal, is trying to fast-track its ratification process to avoid the embarrassment of sitting on the sidelines when it comes into force.
The EU, which accounts for 12 percent of global emissions, originally planned to wait for its 28 member states to approve the deal domestically, but now wants to ratify it on their behalf.
"It's technically possible," said Anna-Kaisa Itkonen, a spokeswoman for EU Climate Commissioner Miguel Arias Canete. "But politically it's a decision of the member states."
With or without the EU, there's a chance that the deal can enter into force as early as the next U.N. climate conference, which starts Nov. 7 in Marrakech, Morocco.
U.N. officials said last week that at least 20 countries had indicated they would join on Wednesday and that they were "absolutely certain" that the deal will come into force this year.
For some the timing is mostly symbolic, because the first round of emissions targets doesn't start until 2020. For others, like the island nations who face an existential risk from rising seas, it's imperative that countries prepare to implement - and improve - their targets as soon as possible.
"We cannot wait," said Maldives Environment Minister Thoriq Ibrahim, who chairs an alliance of small island states. "We are at the forefront of climate change and we are the people who will suffer if there is no action taken early."
---
AP writers Josh Lederman in Washington, and Edith M. Lederer at the United Nations, contributed to this report.
---
Follow Karl Ritter on Twitter at <a href="https://twitter.com/Karl-Ritter">https://twitter.com/Karl-Ritter</a>
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Twenty more countries expected to join Paris Agreement on climate change

At least 20 countries are expected to formally join the...

Indonesian forest fires that choked a swath of Southeast Asia with a smoky haze for weeks last year may have caused more than 100,000 deaths, according to new research that will add to pressure on Indonesia's government to tackle the annual crisis.
The study by scientists from Harvard University and Columbia University to be published in the journal Environmental Research Letters is being welcomed by other researchers and Indonesia's medical profession as an advance in quantifying the suspected serious public health effects of the fires, which are set to clear land for agriculture and forestry. The number of deaths is an estimate derived from a complex analysis that has not yet been validated by analysis of official data on mortality.
The research has implications for land-use practices and Indonesia's vast pulp and paper industry. The researchers showed that peatlands within timber concessions, and peatlands overall, were a much bigger proportion of the fires observed by satellite than in 2006, which was another particularly bad year for haze. The researchers surmise that draining of the peatlands to prepare them for pulpwood plantations and other uses made them more vulnerable to fires.
The estimate of early deaths linked to respiratory illness and other causes covers Indonesia and its neighbors Singapore and Malaysia. It dwarfs Indonesia's official toll of 19 that included deaths from illness and the deaths of firefighters. However, the possible scale of serious health consequences was indicated by a statement from the country's disaster management agency in October that said more than 43 million Indonesians were exposed to smoke from the fires and half a million suffered acute respiratory infections.
The study considered only the health impact on adults and restricts itself to the effects of health-threatening fine particulate matter, often referred to as PM2.5, rather than all toxins that would be in the smoke from burning peatlands and forests. The bulk of the estimated deaths are in Indonesia, by far the most populous of the three countries and the country with the biggest land area affected by haze.
The fires from July to October last year in southern Sumatra and the Indonesian part of Borneo were the worst since 1997 and exacerbated by El Nino dry conditions. About 261,000 hectares of land burned. Some of the fires started accidently, but many were deliberately set by companies and villagers to clear land for plantations and agriculture.
Rajasekhar Bala, an environmental engineering expert at the National University of Singapore, one of five experts who reviewed the paper for The Associated Press and were not involved in the research, said the study is preliminary and involved a "very challenging" task of analyzing the sources and spread of fine particulate matter over several countries and a lengthy time frame.
Even with caveats, it should serve as a "wake-up call" for firm action in Indonesia to curb peatland and forest fires and for regional cooperation to deal with the fallout on public health, he said.
"Air pollution, especially that caused by atmospheric fine particles, has grave implications for human health," he said.
Frank Murray, an associate professor of environment science at Australia's Murdoch University, said the death estimates are not "precise health outcomes" but their overall scale should trigger intensified efforts to deal with the crisis. The study is a major contribution to addressing an international problem, he said.
The study finds there is a high statistical probability that early deaths ranged between 26,300 and 174,300. Its main estimate of 100,300 deaths is the average of those two figures. It predicts 91,600 deaths in Indonesia, another 6,500 in Malaysia and 2,200 in Singapore.
The researchers involved in the study say the model they developed can be combined with satellite and ground station observations to analyze the haze in close to real time. That gives it the potential to be used to direct firefighting efforts in a way that reduces the amount of illness caused, they say.
The annual fires have strained relations between Indonesia and its wealthier neighbors Singapore and Malaysia, who are at the mercy of winds that carry the haze into their territory from Sumatra.
But the brunt of the crisis is faced by millions of Indonesians in Sumatra and Kalimantan, many of them poor and with little or no means to protect themselves from the blanket of smoke.
"Particles penetrate indoors, and housing in Indonesia is very well ventilated, so I don't think there is any avertive behavior that people there could have taken that would have been effective," said Joel Schwartz, an air pollution epidemiologist at Harvard who co-authored the study. "In Singapore, if you close all the windows and turn on the air conditioning you get some protection, which may have happened."
The Indonesian Medical Association's West Kalimantan chapter said Indonesia faces an overall decline in the health of future generations with social and economic consequences if the situation is not tackled.
"We are the doctors who care for the vulnerable groups exposed to toxic smoke," said Nursyam Ibrahim, deputy head of the West Kalimantan chapter of the association. "And we know how awful it is to see the disease symptoms experienced by babies and children in our care."
Howard Frumpkin, dean of the School of Public Health at the University of Washington, said it is possible the health consequences are greater than indicated by the study because higher incidence of certain health problems in developing countries could make populations more susceptible to the effects of fine particulate matter.
----
Follow Stephen Wright: <a href="https://twitter.com/stephenwrightAP">twitter.com/stephenwrightAP</a>
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Haze from Indonesian forest fires killed over 100,000 people

Indonesian forest fires that choked a swath of Southeast Asia...

Addressing fundamental unknowns about the earliest history of Earth’s crust, scientists have precisely dated the world’s oldest rock unit at 4.02 billion years old. Driven by the University of Alberta, the findings suggest that early Earth was largely covered with an oceanic crust-like surface.

“It gives us important information about how the early continents formed,” says lead author Jesse Reimink. “Because it’s so far back in time, we have to grasp at every piece of evidence we can. We have very few data points with which to evaluate what was happening on Earth at this time.” In fact, only three locations worldwide exist with rocks or minerals older than 4 billion years old: one from Northern Quebec, mineral grains from Western Australia, and the rock formation from Canada’s Northwest Territories examined in this new study.

While it is well known that the oldest rocks formed prior to 4 billion years ago, the unique twist on Reimink’s rock is the presence of well-preserved grains of the mineral zircon, leaving no doubt about the date it formed. The sample in question was found during fieldwork by Reimink’s PhD supervisor, Tom Chacko, professor in the Department of Earth and Atmosphere Sciences, in an area roughly 300 kilometres north of Yellowknife. Reimink recently completed his PhD at the University of Alberta before starting a post-doctoral fellowship at the Carnegie Institute for Science in Washington, D.C.
<h3>Zircon provides rock-solid dating</h3>
“Zircons lock in not only the age but also other geochemical information that we’ve exploited in this paper,” Reimink continues. “Rocks and zircon together give us much more information than either on their own. Zircon retains its chemical signature and records age information that doesn’t get reset by later geological events, while the rock itself records chemical information that the zircon grains don’t.”

He explains that the chemistry of the rock itself looks like rocks that are forming today in modern Iceland, which is transitional between oceanic and continental crust. In fact, Iceland has been hypothesized as an analog for how continental crusts started to form.

“We examined the rock itself to analyze those chemical signatures to explore the way that the magma intrudes into the surrounding rock.” One signature in particular recorded the assimilation step of magma from Earth’s crust. “While the magma cooled, it simultaneously heated up and melted the rock around it, and we have evidence for that.”

Reimink says that the lack of signatures of continental crust in this rock, different from what the early continents were expected to look like, leads to more questions than answers. Reimink says one of the biggest challenges as a geologist is that as we travel back in time on Earth, the quantity and quality of available evidence decreases. “Earth is constantly recycling itself, the crust is being deformed or melted, and pre-history is being erased,” remarks Reimink.

“The presence of continents above water and exposed to the atmosphere has huge implications in atmospheric chemistry and the presence or absence of life. The amount of continents on Earth has a large chemical influence both on processes in the deep Earth (mantle and core) and at the Earth’s surface (atmosphere and biosphere). There are constant feedback loops between chemistry and geology. Though there are still a lot of unknowns, this is just one example that everything on Earth is intertwined.”

“No evidence for Hadean continental crust within Earth’s oldest evolved rock unit” appears in the October issue of <a href="http://www.nature.com/ngeo/index.html">Nature Geoscience</a>.

Scientists have dated the Earth's oldest rock unit

Addressing fundamental unknowns about the earliest history of Earth’s crust,...

In the waters off the coast of Hawaii, a tall buoy bobs and sways in the water, using the rise and fall of the waves to generate electricity.
The current travels through an undersea cable for a mile to a military base, where it is fed into Oahu's power grid - the first wave-produced electricity to go online in the U.S.
By some estimates, the ocean's endless motion packs enough power to meet a quarter of America's energy needs and dramatically reduce the nation's reliance on oil, gas and coal. But wave energy technology lags well behind wind and solar power, with important technical hurdles still to be overcome.
To that end, the Navy has established a test site in Hawaii, with hopes the technology can someday be used to produce clean, renewable power for offshore fueling stations for the fleet and provide electricity to coastal communities in fuel-starved places around the world.
"More power from more places translates to a more agile, more flexible, more capable force," Joseph Bryan, deputy assistant secretary of the Navy, said during an event at the site. "So we're always looking for new ways to power the mission."
Hawaii would seem a natural site for such technology. As any surfer can tell you, it is blessed with powerful waves. The island state also has the highest electricity costs in the nation - largely because of its heavy reliance on oil delivered by sea - and has a legislative mandate to get 100 percent of its energy from renewables by 2045.
Still, it could be five to 10 years before wave energy technology can provide an affordable alternative to fossil fuels, experts say.
For one thing, developers are still working to come up with the best design. Some buoys capture the up-and-down motion of the waves, while others exploit the side-to-side movement. Industry experts say a machine that uses all the ocean's movements is most likely to succeed.
Also, the machinery has to be able to withstand powerful storms, the constant pounding of the seas and the corrosive effects of saltwater.
"The ocean is a really hard place to work," said Patrick Cross, specialist at the Hawaii Natural Energy Institute at the University of Hawaii at Manoa, which helps run the Hawaii test site. "You've got to design something that can stay in the water for a long time but be able to survive."


[caption id="attachment_87210" align="alignleft" width="150"]<img class="size-thumbnail wp-image-87210" src="http://www.earth.com/wp-content/uploads/2016/09/wave-energy-test-site-NAFAC_2big_ap-150x150.jpg" alt="Wave energy test site in Hawaii" width="150" height="150" /> Wave energy test site in Hawaii[/caption]
The U.S. has set a goal of reducing carbon emissions by one-third from 2005 levels by 2030, and many states are seeking to develop more renewable energy in the coming decades.
Jose Zayas, a director of the Wind and Water Power Technologies Office at the U.S. Department of Energy, which helps fund the Hawaii site, said the U.S. could get 20 to 28 percent of its energy needs from waves off the U.S. coasts without encroaching on sensitive waters such as marine preserves.
"When you think about all of the states that have water along their coasts ... there's quite a bit of wave energy potential," he said.
Wave energy technology is at about the same stage as the solar and wind industries were in the 1980s. Both received substantial government investment and tax credits that helped them become energy sources cheap enough to compete with fossil fuels.
But while the U.S. government and military have put about $334 million into marine energy research over the last decade, Britain and the rest of Europe have invested more than $1 billion, according to the Marine Energy Council, a trade group.
"We're about, I'd say, a decade behind the Europeans," said Alexandra De Visser, the Navy's Hawaii test site project manager.
The European Marine Energy Centre in Scotland, for example, has 14 grid-connected berths that have housed dozens of wave and tidal energy devices from around the world over the past 13 years, and Wave Hub in England has several such berths. China, too, has been building and testing dozens of units at sea.
Though small in scale, the test project near Kaneohe Bay represents the vanguard of U.S. wave energy development. It consists of two buoys anchored a half-mile to a mile off the coast.
One of them, the Azura, which stands 12 feet above the surface and extends 50 feet below, converts the waves' vertical and horizontal movements into up to 18 kilowatts of electricity, enough for about a dozen homes. The company working with the Navy, Northwest Energy Innovations of Portland, Oregon, plans a version that can generate at least 500 kilowatts, or enough to power hundreds of homes.
The other buoy, a 50-foot-wide, doughnut-shaped device called the Lifesaver, was developed by a Norwegian company. The 3-foot-tall ring is anchored to the ocean floor with cables; when the buoy is moved by the sea, the cables move, turning the wheels of a generator. It is producing on average of just 4 kilowatts but is capable of generating more.
Test sites run by other researchers are being planned or expanded in Oregon and California to take advantage of the powerful waves that pound the West Coast. One of those projects, Cal Wave, run by California Polytechnic State University, hopes to provide utility-scale power to Vandenberg Air Force Base.
The Hawaii buoys are barely noticeable from shore without binoculars, but developers envision dozens of machines working all at once, an idea that could run into the same kind of opposition that wind turbines have faced from environmentalists, fishermen and tourist groups.
"Putting 200 machines on the North Shore of Oahu within a mile or two off the coast might be difficult, said Steve Kopf, CEO of Northwest Energy Innovations. "Nobody wants to look out and see wind turbines or wave machines off the coast."
---
Associated Press Writer Joe McDonald in Beijing contributed to this report.
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Wave energy electricity goes live in Hawaii

In the waters off the coast of Hawaii, a tall...

Residents near two former suburban Navy bases are suing producers of firefighting foam once used there, claiming they contaminated the drinking water.
New York law firm Weitz &amp; Luxenberg filed the federal lawsuit Thursday in Philadelphia on behalf of seven people who lived near the Willow Grove Naval Air Station Joint Reserve Base and the Naval Air Warfare Center. The lawsuit seeks chemical cleanup and unspecified damages.
Named as defendants are The 3M Co., of St. Paul, Minnesota; UK-based Angus Fire; The Ansul Co., of Marinette, Wisconsin; North Carolina-based Buckeye Fire Protection Co.; Wisconsin's Chemguard; and National Foam, of West Chester.
The residents allege the companies should have known perfluorooctane sulfonate and other chemicals would pose health and environmental risks. They're seeking class action status.
"With this lawsuit, we are fighting to ensure that the companies who manufactured and marketed products containing these chemicals - and put their profits ahead of public health in the process - are brought to justice for their wrongdoing," Robin Greenwald, who heads an environmental unit at the law firm, said in a statement.
The chemical compounds have been found in some firefighting foams that were widely used for decades on military bases throughout the country. They also are found in some household items such as food packaging.
The issue has gotten the attention of environmental activist Erin Brockovich, who spoke with residents at a community meeting in Willow Grove in June. Brockovich, who was portrayed by Julia Roberts in a 2000 movie bearing her name, works as a consultant to Weitz &amp; Luxenberg.
No scientific evidence has consistently linked the chemicals to cancer in humans, although some studies have shown that people exposed to high levels of the compounds had higher incidents of kidney, prostate and testicular cancers, the Pennsylvania Department of Health says.
The Navy and National Guard previously agreed to pay about $19 million to provide residents replacement water and install filtration systems after more than a dozen public wells and 140 private wells in the Philadelphia area were taken offline.
Attorney William A. Brewer III, representing 3M, said the claims in the lawsuit have no merit. He said the U.S. military used the product "because it saves lives, which likely explains why this product remains in use about a decade after 3M exited the sales of it."
The company sold the product with instructions on how to safely use and dispose of it, he said.
Tyco Fire Protection Products was aware of the legal action involving its brands Ansul and Chemguard but declined to comment on the ongoing litigation, a spokeswoman said.
Other companies named in the lawsuit did not immediately respond Friday to requests for comment.
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Firefighting foam contaminates drinking water

Residents near two former suburban Navy bases are suing producers...

The U.S. Forest Service has ripped up a portion of the Trail of Tears in the Appalachian Mountains, reopening wounds for Native Americans who consider sacred the land where thousands of their ancestors died during their forced migration westward.
The man-made trenches and berms were discovered last summer but the details about how it happened and those responsible hadn't been publicly identified. In documents obtained recently by The Associated Press, the Forest Service acknowledged that an employee approved construction along a ¾-mile section of the trail in eastern Tennessee without authorization, an embarrassing blunder for an agency that was supposed to be protecting the trail for future generations.
The $28,500 in contracting work done in 2014 involved using heavy equipment to dig three deep trenches called "tank traps" and a series of 35 berms. It was meant to keep out all-terrain vehicles and prevent erosion, but agency officials now say it was done in violation of federal laws.
Sheila Bird of the Cherokee Nation said she cried when she was asked at a meeting with Forest Service officials to talk about the impact of the damage.
"The trail is part of our history, of why we are here in Oklahoma," said Bird, who is the special projects officer for the nation's Tribal Historic Preservation Office.
The portion of the damaged trail lies near Fort Armistead, one of the stops where Cherokees were held during their forced migration West in the 1830s. This part of the trail follows the first commercial road across the mountains in that region, the Unicoi Turnpike, which in turn followed the course of an ancient Native American trail.
The Forest Service has apologized to the tribes for the damage, both physical and emotional, and is consulting with them over how to repair it. No plan has been finalized, and Forest Service spokeswoman Stephanie Johnson said the agency does not yet know what the restoration work will cost.
When the Forest Service dug up portions of the trail on the edge of the Cherokee National Forest in March and June 2014, it didn't even own the land, although it was planning to purchase it, according to Forest Service documents obtained by The Associated Press. The documents were provided to AP by the environmental group Public Employees for Environmental Responsibility and authenticated by the Forest Service.
The documents outline the extensive process the Forest Service employees should have gone through before doing the work but didn't.
For instance, the ranger who approved the project told another employee they didn't' have to comply with the National Environmental Policy Act because they did not own the land.
"Despite the lack of compliance with our own policies for the National Environmental Policy Act and federal laws like the ESA (Endangered Species Act), NPHA (National Historic Preservation Act), and the purchase option's requirements, the project was orally approved," the documents state.
It's not clear what, if anything, happened to the employees who ignored the law. The local ranger who gave the approval for the construction had been with Forest Service for more than 35 years before she retired in February 2015. The Forest Service said it won't discuss personnel matters.
Public Employees for Environmental Responsibility executive director Jeff Ruch said that's not good enough.
"This is one the most blatant official desecrations of a sacred site in modern American history," Ruch said in a statement. "Jaw-dropping incompetence mixed with abject dereliction of duty coated in an impenetrable mantle of bureaucratic self-preservation spawned this debacle."
The group is asking the U.S. Agriculture Department for a thorough review by independent investigators and appropriate disciplinary action.
Months after the damage, Forest Service officials who were still unaware of the work extolled the pristine nature and historical significance of the parcel.
"Protecting the Trail of Tears and other significant sites in this area has been and will continue to be a priority for us," Cherokee National Forest Supervisor JaSal Morris said in an Oct. 2014 news release announcing its purchase.
Many Forest Service officials didn't realize the land had been disturbed until July 2015, when the agency hosted representatives of the Cherokee tribes and the National Parks Service to develop an interpretive plan for the trail and Fort Armistead.
Susan Abram, president of the North Carolina chapter of the Trail of Tears Association, was among a group that hiked out to the trail and discovered the damage.
"Everybody was just kind of shocked," said the Western Carolina University history professor. "This is a national historic trail ... part of our national heritage."
The trail stretches for thousands of miles through nine states. Aaron Mahr, the National Parks Service superintendent for the trail, said his agency works with private landowners and government agencies to protect the portions of the trail that cross their properties. Mahr said seeing photos of the damage done by the Forest Service left him shaking his head.
Jack Baker, National Trail of Tears Association president and a member of the Cherokee Nation Tribal Council, also learned of the destruction by seeing photos.
"I thought it was done deliberately and intentionally to destroy part of the trail. ... Other trail segments are identical and erosion is not really a concern," he said.
Marvin Harper, who lives near the trail and is president of the Coker Creek Heritage Group, took an AP reporter to see the damage Thursday. Clambering over one of the berms and dropping into a trench on the other side, only his head was visible.
"This is an embarrassment and a great loss to all of us who take pride in this part of East Tennessee," he said.
Since the destruction, Forest Service officials are halting all work within a half-mile of either side of the trail in four southern states.
Bird said she still has questions about how the damage came about, but she appreciates that the Forest Service is trying to make it right.
"They came to us with an enormous amount of humility," Bird said.
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US Forest Service admits damaging the Trail of Tears

The U.S. Forest Service has ripped up a portion of...

More than 200 million gallons of contaminated waste water from a fertilizer plant in central Florida leaked into one of the state's main underground sources of drinking water after a massive sinkhole opened up beneath a storage pond, a phosphate company said Friday.
Mosaic, the world's largest supplier of phosphate, said the hole opened up beneath a pile of waste material called a "gypsum stack." The 215-million gallon storage pond sat atop the waste mineral pile. The company said the sinkhole is about 45 feet in diameter.
Mosaic says it's monitoring groundwater and has found no offsite impacts.
"Groundwater moves very slowly," said David Jellerson, Mosaic's senior director for environmental and phosphate projects. "There's absolutely nobody at risk."
The water had been used to transport the gypsum, which is a byproduct of fertilizer production, the company said.
The sinkhole, discovered by a worker on Aug. 27, is believed to reach down to the Floridan aquifer, the company said in a news release. Aquifers are vast, underground systems of porous rocks that hold water and allow water to move through the holes within the rock.
The Floridan aquifer is a major source of drinking water in the state. One of the highest producing aquifers in the world, it underlies all of Florida and extends into southern Alabama, Georgia, and South Carolina.
According to the University of Florida, it's the principal source of groundwater for much of the state, and the cities of Tallahassee, Jacksonville, Gainesville, Orlando, Daytona Beach, Tampa, and St. Petersburg all rely on it. The aquifer also supplies water to thousands of domestic, industrial and irrigation wells throughout the state.
Mosaic began diverting the pond water into an alternate holding area to reduce the amount of drainage when the problem was first detected. The company said it has been "recovering the water by pumping through onsite production wells."
"We have an extensive monitoring system," Jefferson said. "It's already indicating that it's recovering the material, but it will take some time for that process to complete."
Dee Ann Miller, spokeswoman for the state's Department of Environmental Protection, said the company is updating state and federal agencies on the situation.
"Along with reviewing daily reports, DEP is performing frequent site visits to make sure timely and appropriate response continues in order to safeguard public health and the environment," Miller wrote in an email to The Associated Press. "While monitoring to date indicates that the process water is being successfully contained, groundwater monitoring will continue to ensure there are no offsite or long-term effects."
The Polk County phosphate plant is still running.
Jellerson said the water typically flows in a cycle from pond to plant to pond during the fertilizer manufacturing process.
He said the pond with the sinkhole is "now dry," and that once they recover the water that went into the deep hole, it will be reused in plant operations.
The incident comes less than a year after Mosaic, one of the world's largest fertilizer makers, settled a massive federal environmental lawsuit with the U.S. Environmental Protection Agency in which the company agreed to nearly $2 billion in fixes, improvements and cleanups at its plants.
Since the 1960s, toxic solid waste from fertilizer production in Florida has been growing -- some stored in 500-foot-tall piles that sometimes span more than 600 acres. Mosaic makes a common phosphorus-based fertilizer, the production of which creates polluted water and solid waste.
In 2004, during Hurricane Frances, 65 million gallons of polluted waste from a fertilizer plant was sent into waters near Tampa Bay, resulting in thousands of dead fish and other marine life.
And in 1994, another sinkhole in Polk County opened sending tons of waste from one of the company's waste piles into the earth.
EPA found that Mosaic improperly handled its facilities, which posed a threat to the environment and human health. These violations led to last year's legal settlement and the company's public commitment to become more environmentally friendly.
Environmental groups said the damage from the sinkhole could be severe, and adds to decades of pollution from the phosphorous fertilizer industry. Florida is a key center of phosphate mining.
"I wish we could say that watching an environmental tragedy unfolding at a Florida phosphate mining site was a new occurrence, but sadly it's happened repeatedly," said Tania Galloni, an attorney with the Florida office of Earthjustice. "These phosphate companies are playing roulette with our public waters."
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200 million gallons of fertilizer waste leaks into Florida drinking water

More than 200 million gallons of contaminated waste water from...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Nushagak Bay in southwest Alaska

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Flu viruses are more flexible than expected

[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Detecting mercury contamination with the tap of a finger

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Kainji Lake, a reservoir on the Niger River.



In 1968, Kainji Lake was created by the construction of the Kainji Dam. The Niger River, the third longest in Africa, enters the lake in the north.&nbsp;



According to <a href="https://www.earth.com/news/rivers-in-the-american-west-are-a-lifesaving-resource-for-birds/">ESA</a>, the creation of the lake submerged Foge Island and the town of Bussa and permanently flooded other riverine settlements, leaving around 50,000 people displaced.&nbsp;



Large parts of Foge Island are temporarily exposed during low water tides, and the land is often used by migrating fishermen. Kainji Dam is a dam across the Niger River in Niger State of Central Nigeria. 



Wild mammals occur at relatively low densities due to illegal hunting. Lake Kainji has suffered a dramatic decline as a fishery due to the high numbers of artisanal and subsistence fisherfolk using the lake. It has been suggested that a period of closure, together with controlled fishing rights may help improve fish stocks.



Kainji Lake National Park is the oldest of its kind in Nigeria. The park contains three distinct areas: a part of the Kainji Lake, the Borgu Game Reserve to the west of the lake, and the Zugurma Game Reserve to the southeast. The park is home to around 65 mammal species, 350 bird species, and 30 species of reptiles and amphibians. 



Video/ Image Credit: European Space Agency&nbsp;



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Kainji Lake in north central Nigeria

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Today’s Video of the Day from <a href="https://www.igb.illinois.edu/">Carl R. Woese Institute for Genomic Biology</a> reveals how scientists can modify common crops like soybean, rice, and wheat to protect them from heat stress.



“We need to double crop production by 2050 to feed a growing global population, and not only are we not on track to do that, but climate change is further complicating things,” said Amanda Cavanagh, a lecturer at the University of Essex. 



The study is part of Realizing Increased Photosynthetic Efficiency (RIPE), an international research project that aims to develop food crops that turn the sun’s energy into food more efficiently.



“Using an engineering approach we designed multiple alternative metabolic pathways to photorespiration. Testing them in the field showed increases in productivity which led Amanda to significantly move the project forward by showing our engineered plants can withstand pretty extreme temperature stress,” said study co-author and RIPE researcher Paul South.&nbsp;



“As the climate changes and temperature stresses increase the pressure on our global food supply, farmers will need every tool available including engineering approaches like the synthetic biology used here to maintain safe and productive harvests.”



The experts tested plants modified to have more efficient photorespiration to see if they were better adapted to warmer temperatures.&nbsp;



The team found that the engineered plants produced 26 percent more biomass than the wild-type plants exposed to the same temperatures, and had 15 percent less yield loss under the higher temperatures.



Video Credit: Amanda Nguyen/University of Illinois



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Designing crops that can beat the heat

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> explores the ability of salt to transform the way that foods and beverages taste. Salt is known to cover up undesirable flavors, such as bitterness in coffee or beer, but how exactly does sodium chloride change the taste of other compounds?



One previous study showed that, not only does salt suppress bitterness, but also enhances sweetness and sourness. Another study revealed that bitterness reduction by salt seems to be happening at the tongue receptor level as well as in the brain.&nbsp;



While it is known that salt taste is mediated by the presence of sodium channels in the form of taste buds, experts believe that there is also an unknown receptor responsible for how we taste salt that has not yet been identified.&nbsp;



Video Credit: ACS Reactions



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How does salt makes things taste better?

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Santiago, the capital city of Chile. The city is located in the center of the Santiago Metropolitan Region, which has a population of about eight million people.&nbsp;



'The weather of Santiago resembles the Mediterranean climate with dry and warm summers with temperatures reaching up to 35°C (from October to March) and cool and humid winters that can drop to 0°C (from April to September)."



"The city lies in the centre of the country’s central valley around 80 km from the Pacific Ocean to the west and borders Argentina to the east. A tiny part of Argentina is visible in the top-right corner of the image where the mountain crest of the Andes Mountains acts as a divider between the two countries," says ESA.



Video/ Image Credit: ESA



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Santiago, Chile in South America

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Spiral,Galaxy,,Illustration,Of,Milky,Way

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Astronomers at <a href="https://www.jhu.edu/">Johns Hopkins University</a> have created an interactive map of the universe, including the actual position and real colors of 200,000 galaxies. The map allows the public to access data that was previously only available to scientists.



The map was developed using data collected by the Sloan Digital Sky Survey. For over two decades, a telescope in New Mexico was aimed at slightly different locations to capture the night sky.&nbsp;



"Growing up I was very inspired by astronomy pictures, stars, nebulae and galaxies, and now it's our time to create a new type of picture to inspire people," said map creator Brice Ménard, a professor at Johns Hopkins. "Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries. But nobody took the time to create a map that is beautiful, scientifically accurate, and accessible to people who are not scientists. Our goal here is to show everybody what the universe really looks like."



"In this map, we are just a speck at the very bottom, just one pixel. And when I say we, I mean our galaxy, the Milky Way which has billions of stars and planets. We are used to seeing astronomical pictures showing one galaxy here, one galaxy there or perhaps a group of galaxies. But what this map shows is a very, very different scale."



"From this speck at the bottom, we are able to map out galaxies across the entire universe, and that says something about the power of science."



The <a href="https://mapoftheuniverse.net/">interactive map</a> is available online, where it can be downloaded for free.



Video Credit: Johns Hopkins&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Interactive map of the universe includes 200,000 galaxies

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes the first comprehensive estimate of carbon density in the Saharan, Sahel, and Sudanian zones of Africa. In an effort to measure the amount of carbon stored across these drylands, a team of scientists used high-resolution satellite images and artificial intelligence to map nearly 10 billion individual trees. 



"The high spatial resolution (50 cm) combined with AI and field measurements used in this study is key to improving tree inventories in drylands," said Pierre Hiernaux, a French researcher working for NASA. "The ever-increasing availability of very high-resolution satellite imagery will make it possible to assess carbon pools and their dynamics at the individual tree level on a global scale."



"This study is exceptional because it is pioneering a type of approach that will revolutionize the monitoring of trees and forests on a global scale: in the short term, it will be possible to map the world's trees from the centre of the Amazon to our schoolyards," said <a href="https://www.inrae.fr/en">INRAE</a> researcher Jean-Pierre Wigneron.



"Many fields of application will become much more efficient and accurate, such as tracking carbon stocks, biodiversity, monitoring logging and protection against illegal forest degradation, in near real time.”



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Remote sensing will revolutionize the way we monitor trees

[sendtonews key="EjmSP20gQK-2593093-12187" type="single"] Today's Video of the Day from NASA...

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Dublin, the capital and largest city of Ireland. Beyond its pub culture, Dublin is known as a modern culinary destination and a UNESCO City of Literature.



"Dublin is located near the midpoint of Ireland’s east coast in the province of Leinster. The city, which covers an area of around 115 square kilometers, is bordered by the Dublin Mountains, a low mountain range to the south, and is surrounded by flat farmland to the north and west," says ESA.



"The city straddles the River Liffey, which rises in the Wicklow Mountains and flows around 80 kilometers eastwards through the city of Dublin, in which it is canalised and bordered with quays. It then empties into Dublin Bay, an arm of the Irish Sea."



Dublin has an abundance of green spaces, including one of the largest enclosed public parks in any European capital city. Phoenix Park, which was originally formed as a royal hunting park in the 1660s, includes 707 hectares of green space.



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The city of Dublin on Ireland's east coast

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the province of Zaragoza in northeast Spain. The image was captured by the Copernicus Sentinel-2 mission.



"Together with the provinces of Huesca and Teruel, Zaragoza formed the old kingdom of Aragon. Its capital, also called Zaragoza (not visible in this image) is home to around half of Aragon’s population," says ESA.



"The Ebro River can be seen winding its way through the province from west to east in this image. Between its source in the Cantabrian Mountains in the northwest and its delta on the Mediterranean coast, the Ebro River is fed by more than 200 tributaries as it flows 910 km across much of northern Spain."



Since rainfall is very scarce in this region, irrigation in the Ebro basin is critically important. In the valleys surrounding the Ebro River, many fields are used for growing crops such as corn, wheat, and barley.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The province of Zaragoza in northeast Spain

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> features a visual dataset of.methane emissions from wetlands across the globe. Atmospheric methane levels have reached record highs in recent years, and wetlands are a major source of these emissions.&nbsp;



"Methane is an important greenhouse gas that contributes substantially to global warming. On a molecule by molecule basis, methane is much more efficient at trapping heat than carbon dioxide, the main driver of warming," says NASA.



"Though human activities, including agriculture, oil and natural gas production and use, and waste disposal, collectively contribute the majority of methane to the atmosphere, about a third of total methane emissions comes from wetlands."&nbsp;



According to NASA, understanding methane emissions from wetlands and other natural sources is critically important for scientists and policymakers who are working to combat climate change by reducing emissions from human activities.



Video Credit: NASA Goddard



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Wetlands are a major source of methane emissions

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> reveals the evolution of the Columbia Glacier in southeastern Alaska. Columbia is among the fastest shrinking glaciers in the world, and the video documents its rapid retreat over the years.&nbsp;



Columbia Glacier is a large, multi-branched calving glacier that flows out of the Chugach Mountains to the Prince William Sound.&nbsp;



According to USGS, Columbia had a long history of stability prior to 1980, with a length 41 miles, and small, short-lived advances or retreats.



In the years since 1980, however, satellite images have captured Columbia’s alarming retreat. By using false-color images, scientists can distinguish between snow and ice, open water, vegetation, and rocky debris on the glacier’s surface.



The series of false-color images featured in today's video were acquired over the span of 35 years. You can see that by 2021, the glacier’s main branch had retreated about 15 miles from its initial position.



The Columbia Glacier has also lost more than 50 percent of its volume, mostly due to calving. <a href="https://www.earth.com/video/nasa-reveals-3d-visual-of-an-atmospheric-river/">NASA</a> reports that while climate change likely started the retreat, mechanical processes kept the disintegration going.



The NASA images are provided by Jesse Allen, Robert Simmon, Joshua Stevens, and Lauren Dauphin using data from Landsat satellites, from the U.S. Geological Survey, and data from MODIS on NASA’s Terra satellite. The structure of Columbia’s moraine played a large role in the stability of the glacier before 1980. 



Like other tidewater glaciers, the Columbia built up a moraine over time, and the mixture of ice and rock functioned like a dam keeping out the sea. It was supported on one end by the shoreline and by the underwater terminal moraine at the other.



Video Credit: NASA Earth Observatory/&nbsp; NASA’s Scientific Visualization Studio



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The rapid retreat of the Columbia Glacier

[sendtonews key="0879czfG3k-1785905-12187" type="single"] Today’s Video of the Day from NASA...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the Pyrenees Mountains, which form a natural boundary between France and Spain in southwest Europe.



The mountain range is 430 kilometers in length. It stretches from the Mediterranean Sea on the east to the Atlantic Ocean on the west.



At an elevation of 3404 meters, Pico de Aneto is the highest mountain peak in the Pyrenees, and the third-highest peak in Spain. Pico de Aneto is located in the Posets-Maladeta Natural Park, which spans more than 82,000 acres.&nbsp;



"Geological studies have revealed that the Pyrenees Mountains have been around for longer than the Alps, with their sediments first deposited in coastal basins during the Paleozoic and Mesozoic eras," reports ESA.



"The entire mountain range formed due to the upwelling of large sedimentary rocks by the collision of the Iberian and the Eurasian plate around 100 to 150 million years ago, followed by intense erosion from ice and water."



The western Pyrenees receive more precipitation due to moisture blowing in from the Atlantic Ocean. The mountain range contains many lakes, several small glaciers, and some of the highest waterfalls in Europe.



Video &amp; Image Credit: ESA



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The Pyrenees Mountains in southwest Europe

[sendtonews key="6HyfrAJTBI-1831843-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from <a href="https://www.stowers.org/">Stowers Institute for Medical Research</a> describes why experts are studying zebrafish to gain a better understanding of how the immune system responds to injury. Zebrafish have the ability to repair and regenerate organs.



“Organ regeneration offers an exciting opportunity for studying the immune system and to inquire why some species can regenerate organs like the heart or missing limbs while others like humans cannot,” explained Dr. Tatjana Piotrowski.



Zebrafish sensory organ hair cells are an ideal system to investigate the pathways and cell types involved in regeneration since they are easily destroyed with antibiotics and begin regenerating within five hours. This enabled the researchers to identify the exact timing and genetic programs for each anti-inflammatory macrophage activation state.&nbsp;



“Our hypothesis is that human macrophages do not receive the proper chemical activation 'cocktail' to instruct pro-regenerative processes,” said Dr. Nicolas Denans. “Identifying the molecular recipe of macrophage activation in zebrafish may one day enable us to design regenerative immunotherapies in humans.”&nbsp;&nbsp;&nbsp;



“The new evidence is a valuable resource for comparative studies on the genetic programs involved in macrophage-mediated repair and regeneration. In other words, different types of injuries may induce different kinds of inflammatory responses. We want to decipher whether this 'language' is universal or if there are a variety of dialects."



Video Credit: Stowers Institute for Medical Research&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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How the immune system responds to injury

[sendtonews key="0dEcERCq61-2283382-12187" type="single"] Today’s Video of the Day from Stowers...

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes how record-breaking heat expressed itself around the world in 2022.



Scientists have determined that 2022 was the 5th warmest year since 1880. Furthermore, the last nine consecutive years have been the warmest on record.



From devastating floods and wildfires to natural disasters like Hurricane Ian, 2022 showed us yet again how a warming climate affects people across the globe.&nbsp;



"As we look back at 20:22 and years past, we see that each year we better understand the challenges we face and how important it is to meet them," says NASA.



Video/ Image Credit: NASA Goddard



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2022 illustrated the consequences of a warming climate

[sendtonews key="3UUsNkFOuS-2487333-12187" type="single"] Today's Video of the Day from NASA...

Earth,Like,Exoplanet,3d,Render

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes two exoplanets that are orbiting a star 218 light-years away. A team of researchers led by the University of Montreal has found evidence that these planets are "water worlds."



The experts used data from NASA’s Hubble and Spitzer Space Telescopes. They discovered that exoplanets Kepler-138 c and Kepler-138 could be composed largely of water.



"We previously thought that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-Earths," explained study co-author Björn Benneke.&nbsp;



"However, we have now shown that these two planets, Kepler-138 c and d, are quite different in nature and that a big fraction of their entire volume is likely composed of water. It is the best evidence yet for water worlds, a type of planet that was theorized by astronomers to exist for a long time."



Video Credit: NASA Goddard



Image Credit: NASA, ESA, and Leah Hustak (STScI)



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Two distant planets may be "water worlds"

[sendtonews key="QIoVYJqRBi-2434608-12187" type="single"] Today's Video of the Day from NASA...

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Satellites reveal how Earth's systems are interconnected Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes Earth’s interconnected systems, and how this network is affected by rising temperatures.&nbsp;



During 2020, average global temperatures matched the hottest year on record. The hurricane season was also record-breaking, with many of the storms intensifying at extraordinary speeds. Hot water in the ocean is fuel for hurricanes. The satellite data shows that it's all one interconnected system showing how Satellites reveal how Earth's systems are interconnected.



According to NASA, dust swept up from Northern Africa plays a major role in the formation of hurricanes, and is also a key source of fertilization in the Amazon rainforest. As a result of<a href="https://www.earth.com/news/seagrass-wasting-disease-is-fueled-by-climate-change/"> climate</a> change, dust plumes are expected to decline, which will have an effect on vegetation far away.&nbsp;



Images from Earth-observing satellites show how the world’s plant life is affected by natural disasters, fires, and deforestation. Satellites also reveal how widespread changes in vegetation impact waterways,&nbsp; the climate, air quality. Satellites communicate by using radio waves to send signals to the antennas on the Earth. "Earth From Space" is a groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. 



Video Credit: NASA Goddard&nbsp;



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Satellites reveal how Earth's systems are interconnected

[sendtonews key="JbW4VsY53O-1632195-12187" type="single"] Satellites reveal how Earth's systems are interconnected...

Today’s Video of the Day from the <a href="https://welcome.miami.edu/">University of Miami</a> Rosenstiel School of Marine and Atmospheric Science explores how changes in water temperatures have affected tiger shark habitats and movements in the North Atlantic Ocean. The study reveals that rising temperatures have caused the sharks to shift toward the poles over the past 40 years.



“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” explained study lead author Neil Hammerschlag. “These results have consequences for tiger shark conservation, since shifts in their movements outside of marine protected areas may leave them more vulnerable to commercial fishing.”



The researchers analyzed nine years of tracking data from satellite-tagged tiger sharks, combined with four decades of conventional tag and recapture data provided by National Oceanic and Atmospheric Administration (NOAA) Cooperative Shark Tagging Program.



The experts found that during the last decade of record heat, for every one-degree Celsius increase in water temperatures, tiger sharks migrated further poleward by over 400 kilometers. They also migrated two weeks earlier than usual to waters off the northeastern coast of the United States.



“Given their role as apex predators, these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans,” concluded Professor Hammerschlag.



Video Credit: University of Miami Rosenstiel School of Marine and Atmospheric Science



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Tiger sharks are shifting poleward as temperatures rise

Today’s Video of the Day from the University of Miami...