You probably know at least a little bit about ocean circulation around the world, also known as currents. In fact, you may have felt smaller currents yourself on a day at the beach.



But have you heard bout the "great global ocean conveyor belt," which is a vast network of currents that constantly moves water around the entire planet?



This massive system helps distribute heat around the world, influencing everything from temperatures to rainfall. Unfortunately, it's slowing down and on the verge of total collapse.



Scientists have been studying this phenomenon, and according to recent research published in <a href="https://www.nature.com/articles/s41561-024-01568-1" target="_blank" rel="noreferrer noopener">Nature Geoscience</a>, it's a bigger deal than we thought. 



<h2 class="wp-block-heading" id="h-ocean-circulation-and-the-amoc">Ocean circulation and the AMOC?</h2>



The Atlantic Meridional Overturning Circulation, or AMOC, is like a massive ocean conveyor belt that moves warm and cold water around the <a href="https://www.earth.com/news/why-the-atlantic-ocean-may-ultimately-vanish/" target="_blank" rel="noreferrer noopener">Atlantic Ocean</a>. 



It starts in the Gulf of Mexico, where warm, salty water flows northward along the eastern coast of the United States and across the Atlantic towards Europe. 



As this warm water reaches the North Atlantic, it cools down, becomes denser, and sinks deep into the ocean. 



This sinking process pulls more warm water north to replace it, creating a continuous loop that helps <a href="https://www.earth.com/news/collapse-of-major-ocean-system-would-cause-weather-chaos/" target="_blank" rel="noreferrer noopener">regulate the climate</a> by distributing heat across the planet. 



Thanks to the AMOC, regions like Western Europe enjoy milder winters than they would otherwise.



Humans rely on the AMOC in several important ways. By regulating global temperatures, it helps maintain stable weather patterns, which are crucial for agriculture, ecosystems, and our daily lives. 



Researchers point out that the Atlantic Meridional Overturning Circulation (AMOC) is now weaker than at any other time in the past 1,000 years.



The research team from several leading universities explains that global warming is behind this slowdown. 



Their new modeling suggests that meltwater from the <a href="https://www.earth.com/news/greenlands-melting-icebergs-may-not-be-threat-to-ocean-currents-amoc/" target="_blank" rel="noreferrer noopener">Greenland ice sheet</a> and Canadian glaciers could be the missing piece of the puzzle.



<h2 class="wp-block-heading" id="h-why-should-we-care-about-this">Why should we care about this?</h2>



"Our results show the Atlantic overturning circulation is likely to become a third weaker than it was 70 years ago at 2°C of global warming," says the research team. 



"This would bring big changes to the <a href="https://www.earth.com/news/the-arctic-is-melting-fast-but-a-slowing-ocean-current-could-help/" target="_blank" rel="noreferrer noopener">climate and ecosystems</a>, including faster warming in the southern hemisphere, harsher winters in Europe, and weakening of the northern hemisphere's tropical monsoons."



Think about that for a second. A weaker ocean current could mean colder winters in Europe and shifts in rainfall patterns that affect millions of people. It's not just about the ocean; <a href="https://www.earth.com/news/disastrous-climate-changes-of-the-last-ice-age-could-happen-again/" target="_blank" rel="noreferrer noopener">it's about our daily lives</a>.



<h2 class="wp-block-heading" id="h-meltwater-and-ocean-circulation">Meltwater and ocean circulation</h2>



The Earth has already warmed 1.5ºC since the industrial revolution. And get this: the Arctic has been heating up nearly four times faster than the rest of the planet. 



All that heat is melting Arctic sea ice, glaciers, and the Greenland ice sheet.



"Since 2002, Greenland lost 5,900 billion tons (gigatons) of ice," notes the research team. "To put that into perspective, imagine if the entire state of Texas was covered in ice 26 feet thick."



All this fresh meltwater flowing into the subarctic ocean is lighter than salty seawater, so it doesn't sink as much. 



That messes with the southward flow of deep, cold waters from the Atlantic and <a href="https://www.earth.com/news/climate-change-will-impact-the-gulf-stream-more-than-we-thought/" target="_blank" rel="noreferrer noopener">weakens the Gulf Stream</a> -- the same current that gives Britain its mild winters.



<h2 class="wp-block-heading" id="h-ripple-effects-around-the-globe">Ripple effects around the globe</h2>



So, what's the big deal with the Gulf Stream slowing down? Well, for starters, Europe could face harsher winters. 



<a href="https://www.earth.com/news/climate-paradox-ocean-current-collapse-could-plunge-europe-into-cold/" target="_blank" rel="noreferrer noopener">Places like Britain</a> might start feeling more like their chilly counterparts at the same latitude, such as parts of Canada.



<figure class="wp-block-image aligncenter size-full is-resized"><a href="https://www.earth.com/wp-content/uploads/2024/11/Atlantic-Meridional-Overturning-Circulation_AMOC_collapsing_Nature-Geoscience_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/Atlantic-Meridional-Overturning-Circulation_AMOC_collapsing_Nature-Geoscience_1s.webp" alt="The addition of meltwater in the North Atlantic leads to localised cooling in the subpolar North Atlantic and warming in the South Atlantic. Credit: Nature Geoscience (2024)." class="wp-image-1951410" style="width:300px;height:auto"/></a><figcaption class="wp-element-caption">The addition of meltwater in the North Atlantic leads to localised cooling in the subpolar North Atlantic and warming in the South Atlantic. Credit: Nature Geoscience (2024).</figcaption></figure>



"Our new research shows meltwater from the Greenland ice sheet and Arctic glaciers in Canada is the missing piece in the climate puzzle," the researchers explain. 



When they included this meltwater in their simulations, the slowing of the oceanic circulation made sense.



The study confirms that the Atlantic overturning circulation has been slowing down since the mid-20th century. It also gives us a sneak peek into <a href="https://www.earth.com/news/atlantic-and-arctic-mixing-is-crucial-for-earths-climate-stability/" target="_blank" rel="noreferrer noopener">what's coming next</a>.



<h2 class="wp-block-heading" id="h-northern-and-southern-oceans-connected">Northern and Southern oceans connected</h2>



"Our new research also shows the North and South Atlantic oceans are more connected than previously thought," the team states. 



Changes in one part of the ocean can quickly affect distant regions. When the oceanic circulation is strong, it transfers a lot of heat to the <a href="https://www.earth.com/news/antarctic-warming-triggers-rising-north-atlantic-sea-levels/" target="_blank" rel="noreferrer noopener">North Atlantic</a>. 



But when it weakens, the surface of the ocean south of Greenland doesn't warm up as much, leading to what's called a "warming hole." Meanwhile, the South Atlantic ends up storing more heat and salt.



<h2 class="wp-block-heading" id="h-time-is-not-on-our-side">Time is not on our side</h2>



"Our simulations show changes in the far North Atlantic are felt in the South Atlantic Ocean in less than two decades," the researchers reveal. This means the effects of the slowdown are spreading faster than we thought.



Climate projections have suggested the Atlantic overturning circulation will weaken by about 30% by 2060. But hold on -- that's without considering all that extra meltwater.



"The Greenland ice sheet will continue melting over the coming century, possibly raising global sea level by about 4 inches," the study notes. 



"If this additional meltwater is included in climate projections, the overturning circulation will weaken faster. It could be 30% weaker by 2040. That's 20 years earlier than initially projected."



<h2 class="wp-block-heading" id="h-what-can-we-do">What can we do?</h2>



Such a rapid decrease in the overturning circulation will shake things up. 



Europe might see colder winters, the northern tropics could get drier, and places like the southern United States might experience warmer, wetter summers.



"Our climate has changed dramatically over the past 20 years," the researchers warn. "More rapid melting of the ice sheets will accelerate further disruption of the climate system."



So, what does this all mean for us? It means we have even less time to get our act together. Reducing emissions isn't just a good idea -- it's crucial.



Our planet's systems are interconnected in ways we're only beginning to understand. If we want to keep things from getting worse, we need to act now. Every little bit counts, and the clock is ticking.



The full study was published in the journal <a href="https://www.nature.com/articles/s41561-024-01568-1" target="_blank" rel="noreferrer noopener">Nature Geoscience</a>.



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Collapse of Earth's main ocean water circulation system is already happening

You probably know at least a little bit about ocean circulation around the world, also known as currents. In fact, you may have felt smaller currents yourself on a day at the beach. But have you heard bout the "great global ocean conveyor belt," which is a vast network of currents that constantly moves water around the entire planet? This massive system helps distribute heat around the world, influencing everything from temperatures to rainfall. Unfortunately, it's slowing down and on the verge of total collapse. Scientists have...

Artificial night lighting is causing widespread impacts to wildlife, according to researchers at the <a href="https://www.exeter.ac.uk/">University of Exeter</a>. The team analyzed more than 100 relevant studies and found consistent evidence of physical and behavioral changes in animals, particularly related to their hormone levels and sleep-wake cycles.

In every animal species studied, levels of the sleep-regulating hormone melatonin were reduced by exposure to artificial lights.

The researchers said that artificial night lighting has a diverse range of effects across the natural world, and should be limited whenever possible.

"Lots of studies have examined the impacts of artificial night-time lighting on particular species or communities of species," said study co-author Professor Kevin Gaston. "Our research brings those studies together - and we find the effects are very diverse and very pervasive."

"Particularly strong responses are seen in hormone levels, the timing of daily activity in diurnal (daytime) species, and 'life-history' traits such as number of offspring."

"People may imagine this is all about powerful light, but in fact we are seeing a lot of responses at quite low levels of artificial light."

Dr. Dirk Sanders said the differences were found in both animals that are active during the day and those that are active at night. 

"For rodents, which are mostly nocturnal, the duration of activity tended to be reduced by night-time lighting," said Dr. Sanders. "In contrast, for birds - with all of those included strictly diurnal - artificial light led to an extension of the duration of their activity, with singing and foraging starting earlier."

Previous studies have shown that artificial night lighting has a broad scope of impacts, ranging from reducing pollination to tricking trees into budding earlier in spring.

Just like climate change, night-time lighting appears to benefit some species in certain locations, but Professor Gaston said the clear message of the study is to reduce lighting where possible.

"Both climate change and night-time lighting are human-driven and enormously disruptive to the natural world. Historically, we have not really worried about the impact of night-time lighting. Only now are we discovering its wide-ranging effects," said Professor Gaston.

"Our study shows that we should, as a matter of principle, only use night-time lighting where we need it and no further, and at intensities that we need and no more. In effect, we need to view light like any other pollutant."

"Obviously it would be ridiculous to say 'switch the world's lights off' - but we could reduce our use of light immensely with absolutely no impact on ourselves."

Professor Gaston is the scientific advisor on an upcoming natural history series called Earth at Night in Colour, which will be released on Apple TV+ on December 4th.

The study is published in the journal <a href="https://www.nature.com/natecolevol">Nature Ecology &amp; Evolution</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Artificial night lighting is disrupting the natural world

Artificial night lighting is causing widespread impacts to wildlife, according...

Just ahead of Election Day, near-Earth asteroid will make a close approach. As the anticipation builds for what is being called the most important U.S. election of our lifetime, scientists are eagerly awaiting an entirely different type of event. On November 2nd, an asteroid that was discovered in 2018 is expected to pass relatively very close to the <a href="http://www.earth.com/news/fireball-meteor-that-fell-to-earth-contains-extraterrestrial-organic-compounds/">Earth</a>. 

Regardless of its close encounter, however, the space rock known as 2018VP1 does not pose a threat to our planet. According to NASA, the asteroid is too small to do any damage, even if it does reach Earth's atmosphere.

"Asteroid 2018VP1 is very small, approx. 6.5 feet, and poses no threat to Earth! It currently has a 0.41% chance of entering our planet’s atmosphere, but if it did, it would disintegrate due to its extremely small size," <a href="https://www.jpl.nasa.gov/asteroidwatch/">NASA Asteroid Watch</a> tweeted on August 23.

The asteroid was first discovered in 2018 by scientists at the Zwicky Transient Facility at Caltech's Palomar Observatory. During the two years that have followed, experts have struggled to monitor the space rock because it is so small. Just ahead of Election Day, near-Earth asteroid will make a close approach

Since 1998, NASA has tracked thousands of near-Earth objects, none of which are known to be potentially hazardous to our planet in the near future. 

Back in August, a car-size asteroid flew within about 1,830 miles of Earth, which is the closest flyby ever recorded. Because the asteroid was moving toward us from the direction of the sun, it went completely undetected until about six hours after its approach.

Paul Chodas is the director of NASA's <a href="https://cneos.jpl.nasa.gov/">Centre for Near Earth Object Studies</a>."There's not much we can do about detecting inbound asteroids coming from the sunward direction, as asteroids are detected using optical telescopes only (like ZTF), and we can only search for them in the night sky," Chodas told Business Insider.

"The idea is that we discover them on one of their prior passages by our planet, and then make predictions years and decades in advance to see whether they have any possibility of impacting."

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Just ahead of Election Day, near-Earth asteroid will make a close approach

Just ahead of Election Day, near-Earth asteroid will make a...

A new study from the <a href="https://www.umontreal.ca/en/">University of Montreal</a> suggests that when children are prepared for kindergarten, they are also better prepared for life's greater journey, including higher <a href="http://www.earth.com/news/higher-educational-status-linked-to-healthier-diet/">education</a>. 

"We've known for years that getting off to a good start in kindergarten leads to better achievement over the long-term," said lead author Professor Caroline Fitzpatrick. "But now with our study we can really lock in the idea that early childhood skills help you achieve success and adopt a healthier lifestyle in emerging adulthood. And that's promising for society as a whole."

According to study senior author Professor Linda Pagani, many children begin kindergarten inadequately prepared to benefit from classroom instruction. 

"Those who go in unprepared risk struggling throughout their academic journey. They arrive without the necessary tools in terms of cognitive skills, social skills and motor skills from physical activity."

The researchers analyzed the link between kindergarten preparedness and academic, psychological, and health risks that emerged by the end of high school.

"Kindergarten math skills contributed to better end-of high-school achievement and a lower dropout risk, and that was supported by observations from teachers, who also noted a reduced risk of substance abuse later on," said Professor Fitzpatrick.

The team found that classroom engagement in kindergarten also predicted involvement in physical activity, and was associated with a 65-percent lower risk of excess weight by age 17.

The research was focused on data from the Quebec Longitudinal Study of Child Development, which involved 2,000 children born in 1997 or 1998.

Initially, each child's knowledge of math and vocabulary was assessed by trained experts at age 5. Following this assessment, teachers reported kindergarten classroom engagement every year, including how well a child executed tasks, followed directions, and worked with others. 

At age 17, the participants reported on their grades, feelings of connectedness, whether they abused drugs or alcohol, their involvement in physical activity, and their height and weight. 

In addition, the researchers estimated the drop-out risk for each child based on their grades retention and engagement at school.

The team analyzed the data while accounting for relevant factors such as maternal depression, immigration status, family configuration and socioeconomic status. Key indicators like IQ, internalizing and externalizing behaviors, and gender were also taken into consideration.

"Early childhood readiness forecasts a later protective edge in emerging adulthood and suggests that youngsters who begin school with the right preparedness gain a lifestyle advantage," said Professor Fitzpatrick. 

"Our findings show a way to eliminate the established link between underachievement and disease by providing children with the conditions that will promote kindergarten readiness."

"Promoting kindergarten readiness seems, over the long-term, to help reduce the lifestyle risks generated by dropping out of high school," concluded Professor Pagani. "Therefore, policies to promote and preserve children's early skills, such as providing stimulating childcare and diminishing family adversity, may thus represent a valuable policy strategy for governments to invest in."

The study is published in the journal <a href="https://pediatrics.aappublications.org/">Pediatrics</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Kindergarten readiness predicts a child's academic success

A new study from the University of Montreal suggests that...

A new study from <a href="https://plos.org/">PLOS</a> has investigated the main stressors that impact koala populations in the Australian state of New South Wales. The iconic species is declining across Australia as a result of bushfires and human development, and has become vulnerable to <a href="http://www.earth.com/news/plankton-began-hunting-their-own-food-to-survive-a-mass-extinction-event/">extinction</a>. 

"In theory, Australia should have relatively few conservation concerns; its national population density is lo by global standards, most of the continent remains sparsely settled and little modified, and the nation is relatively affluent," noted the study authors. 

"However, since European Settlement in 1788, 30 mammal species endemic to Australia have become extinct, with 55 others experiencing a worsened conservation status. This statistic is primarily attributed to the fact that humans alter areas of pristine habitat that is rich with biodiversity, so as to accommodate rapid population growth."

To gain a better understanding of the patterns of decline among koala populations, the scientists analyzed three decades of koala rescue data from three wildlife rescue groups in New South Wales. The data include more than 12,500 koala sightings, as well as cases where a koala was admitted for clinical care, between 1989 and 2018.

The researchers determined that the most common reason that a koala was documented or admitted for clinical care was due to disease, especially chlamydia. Over the course of the study period, the incidents of disease among koalas increased. As a result, they were released less often and euthanized more often. 

According to the experts, the data indicates that increasing human development has the biggest impact on koala populations through a variety of stressors, including habitat disturbance, vehicle collisions, and dog attacks. The prevalence of disease may be linked to the effect of bushfires on the koalas' immune systems. 

The findings could help inform efforts to protect koala populations through actions such as bushfire control, sustainable agricultural practices, environmental planning, and governmental policy.

"Australia's national wildlife icon, the Koala currently faces the brink of extinction crisis due to environmental trauma and diseases," wrote the researchers. "We present decadal periods of evidence of significant stress and mortality risks of wild koala populations across the major hotspots in South-eastern Australia."

The study is published in the journal <a href="https://journals.plos.org/plosone/">PLOS ONE</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Human development has the biggest impact on dwindling koala populations

A new study from PLOS has investigated the main stressors...

Teenagers who feel supported by their teachers experience benefits that extend far beyond the classroom. A study published by the <a href="https://www.apa.org/">American Psychological Association</a> has found a link between positive student-teacher relationships and long-term health benefits.

While friendships are obviously very important to adolescents, the researchers did not find the same positive health benefits associated with peer relationships.

"This research suggests that improving students' relationships with teachers could have important, positive and long-lasting effects beyond just academic success," explained study co-author Dr. Jinho Kim. "It could also have important health implications in the long run."

Dr. Kim said that previous research has also suggested that social relationships in adolescence may be linked to health outcomes in adulthood. This could be because poor relationships can lead to chronic stress, which increases the risk for developing diseases.

However, it has remained uncertain whether the link between teen relationships and lifetime health is causal. For example, other factors like different family dynamics could contribute to both relationship problems in adolescence and to poor health in adulthood. 

Furthermore, most relevant studies have focused on teens' relationships with their peers, and not their relationships with teachers.

To investigate, Dr. Kim analyzed data from nearly 20,000 participants who were involved in the Add Health study, which followed participants for 13 years from seventh grade into early adulthood. The volunteers included more than 3,400 pairs of siblings, who answered questions including: "How much do you agree that friends care about you?" and "How much do you agree that teachers care about you?" 

When they were adults, the study participants self-reported on their physical and mental health and were tested for various markers of physical health, such as blood pressure. 

As expected, Dr. Kim found that participants who had reported better relationships with both their peers and teachers in middle school and high school also reported better physical and mental health in their mid-20s. 

However, when he controlled for family background by looking at pairs of siblings together, only the link between teacher relationships and good health in adulthood remained significant.

The results suggest that teacher relationships are even more important than previously realized, and that schools should invest in training teachers on how to build warm and supportive relationships with their students, said Dr. Kim. "This is not something that most teachers receive much training in, but it should be."

The study is published in the journal <a href="https://www.apa.org/ed/graduate/specialize/school">School Psychology</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Positive student-teacher relationships improve long-term health

Teenagers who feel supported by their teachers experience benefits that...

Wild animals are flocking to backyards for food and shelter, according to a new study from <a href="https://www.ncsu.edu/">NC State University</a>. The research explains why animals are sometimes more abundant and diverse in the suburbs than they are in the wilderness. 

Study co-author Roland Kays is an associate professor at NC State and the director of the Biodiversity &amp; Earth Observation Lab at the NC Museum of Natural Resources.

"They're using the gardens a little bit, they're using the brush piles a little bit, and they're using the water features, but feeding has the most dramatic influence on animal activity in the backyard," said Professor Kays.

The researchers set out to investigate what is known as the "urban wildlife paradox." Even though human development is generally associated with biodiversity loss, scientists have found that moderately developed areas frequently host a variety of mammals compared with wild areas.

"There's this idea that nature and humans don't coexist well," said Professor Kays. "But what we've been finding is that when it comes to mammals, especially in North America, they actually do pretty well around people. You end up with high abundance. You expect there to be fewer animals, and there's actually more."

To examine whether food and shelter attract animals in suburban areas, the researchers set up cameras in the backyards of 58 homes near Raleigh, Durham, and outside of Chapel Hill. For comparison, the team set cameras up in nearby forests, rural, and urban areas. 

In collaboration with experts at the University of Montana, the researchers analyzed the images. They identified seven species - squirrels, gray and red foxes, Virginia opossums, eastern cottontail rabbits, woodchucks, and eastern chipmunks - that were more frequently seen in yards compared to forests. In addition, animals such as white-tailed deer, squirrels, and raccoons were found to be more common in suburban forests compared to rural ones.

"This basically confirmed the urban-wildlife paradox, showing that some species are more abundant in yards," said Professor Kays. "It's not a big surprise if you live in the suburbs - you see the animals. It's the squirrels, raccoons, deer and opossum."

Feeding animals, particularly with birdfeeders, had the strongest influence on the abundance of animals in a yard. For example, eastern gray squirrels were more common at feeders than in suburban or rural forests. Cottontail rabbits, raccoons, and opossums were also frequently spotted at birdfeeders.

"This supports the idea that direct human subsidies are a big part of the explanation for the urban-wildlife paradox," said Professor Kays. "It shows that individual decisions by homeowners and private property owners can have a big impact on the wildlife in the backyard and living in the area."

According to Professor Kays, the findings raise questions about what homeowners should do, and whether attracting wildlife is good or bad.

"You see widespread recommendations: Don't feed the bears. Where do you draw the line from small birds to squirrels, rabbits and raccoons? When does it become bad to feed the animals, even if you're doing it accidentally?" 

"On one hand many people enjoy having wildlife around and they can help support a healthy local ecosystem; however, they could cause conflict with people."

The study is published in the journal <a href="https://www.frontiersin.org/journals/ecology-and-evolution">Frontiers in Ecology and Evolution</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Wild animals are moving to the suburbs

Wild animals are flocking to backyards for food and shelter,...

So far this year, severe wildfires in the western United States have burned more than 8 million acres, which is an area larger than the size of Maryland. The affected areas are now facing the threat of destructive debris flows, and <a href="https://www.usgs.gov/">USGS</a> scientists are urgently working to gain a better understanding of how and when this type of slope failure occurs.

Debris flows are fast-moving rivers of water, rock, soil, and vegetation that are particularly dangerous because they usually happen with no warning. While landslides typically require prolonged periods of rain and saturated ground, a debris flow can be triggered after just a few minutes of intense rainfall on a dry slope.

The rivers of debris often gain enough power to level everything in their paths, including trees, vehicles, and homes. 

In 2018, soon after one of Southern California's largest wildfires, a half an inch of rain fell in a matter of five minutes across a deforested area of the Santa Ynez Mountains. Debris flows carried an avalanche of mud and boulders into Montecito, where 23 people were killed. Dozens of homes were buried and hundreds more were damaged.

To investigate the origin of debris and mud flows, the USGS team studied slope failure at two sites in the San Gabriel Mountains. The first site was burned in 2016 during the San Gabriel Complex fire, and the second site was burned during the 2014 Colby fire. 

The researchers found that there were major differences in slope failure between the first and the third years after the fires. The results will provide critical insight into when and where debris flows and other types of slope failure are most likely to occur.

"In the first year after each fire, we observed debris flows generated by rainfall runoff," explained study lead author Francis Rengers. "But as we continued monitoring, we were surprised to see that a storm with a higher rainfall intensity than the first year's storms, resulted in more than 280 shallow landslides, rather than debris flows, in the third year."

Rengers explained that severe wildfires make soils more water-repellent, and rainfall tends to run off burned ground. "If water is not soaking in, it's flowing over the surface." 

Wildfires remove ground cover that would normally serve as a barrier to slow the speed and momentum of a debris flow. According to Rengers, incineration can also allow rainfall on bare soil to create a "surface seal" that further increases runoff.

Landslides are less fluid than debris flows and glide as cohesive mass along a rupture plane.

Because they have much shorter runoffs than debris flows, landslides pose different hazards. 

"The landslides we observed would primarily impact local infrastructure in the forest, such as roads, transmission lines, and culverts," said Rengers. By contrast, he noted, debris flows move sediment much further downstream - posing a major threat beyond the hillslopes. 

The findings offer some indication that the threat of slope failure has a limited duration. The researchers found that within five years, the density of landslides on burnt slopes in the San Gabriels was nearly equal to the density in unaffected regions. The evidence suggests that vegetation can recover within half a decade.

"Our model suggests that debris flows will be the primary concern during the next one to two years, at least in the burn scars in Southern California, and after that the concern will shift toward shallow landslide hazards," said Rengers. "I hope our work offers land managers useful expectations regarding how these processes are likely to evolve and helps them prioritize post-wildfire mitigation and planning."

The research was presented at the annual meeting of the <a href="https://www.geosociety.org/">Geological Society of America</a>, GSA 2020 Connects Online.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Western U.S. wildfires will increase the threat of dangerous debris flows

So far this year, severe wildfires in the western United...

Researchers at the <a href="https://admissions.utexas.edu/">University of Texas at Austin</a> report that mutations may have made the <a href="http://www.earth.com/news/air-pollution-has-increased-covid-19-deaths-by-at-least-15-percent/">coronavirus</a> more contagious. As SARS-COV-2 evolved, the D614G mutation located in its spike protein made the virus more infectious, allowing it to spread more easily. 

The study involved more than 5,000 COVID-19 patients in Houston, and was focused on the various genetic mutations emerging in different strains of SARS-COV-2 since the time of the initial outbreak. 

According to the researchers, the spike protein is continuing to accumulate additional mutations with unknown abilities. Lab experiments revealed that at least one such mutation allows the protein to evade a neutralizing antibody that humans naturally produce to fight SARS-CoV-2 infections.

"The virus is mutating due to a combination of neutral drift - which just means random genetic changes that don't help or hurt the virus - and pressure from our immune systems," said study co-author Professor Ilya Finkelstein.

In collaboration with experts at Houston Methodist Hospital, the UT Austin team tested different genetic variants of the spike protein, which is used by the virus to gain entry into host cells. The experts measured the protein's stability by examining how well it binds to a receptor on host cells and to neutralizing antibodies. 

The researchers found that SARS-CoV-2 was independently introduced to the Houston area many times from diverse geographic regions, including virus strains from Europe, Asia, South America,  and elsewhere in the United States. 

During the initial wave, 71 percent of the coronaviruses identified in COVID-19 patients in Houston had the D614G mutation on the spike protein. When the second wave of the pandemic hit Houston during the summer, this variant was found in 99.9 percent of the patients.

The same trend has been observed worldwide. A study that was based on more than 28,000 genome sequences showed that SARS-COV-2 strains with the infectious mutation took over as the globally dominant form of SARS-CoV-2 in about one month.

In another study of more than 25,000 genome sequences in the U.K., experts have determined that the D614G mutation allowed viruses to transmit faster than those without it and caused larger clusters of infections.

Some scientists believe the D614G mutation may have simply been more common in the first viruses to arrive in Europe and North America, which would have given them a head start on other strains.

"The virus continues to mutate as it rips through the world," said Professor Finkelstein. "Real-time surveillance efforts like our study will ensure that global vaccines and therapeutics are always one step ahead."

Overall, the team found a total of 285 mutations across thousands of infections, most of which did not seem to affect the severity of COVID-19. Ongoing studies will continue to monitor the third wave of COVID-19 patients to understand how the virus is adapting to neutralizing antibodies that are produced by our immune systems. Each new infection gives SARS-CoV-2 an additional chance to develop more dangerous mutations.

"We have given this virus a lot of chances," study lead author James Musser told The Washington Post. "There is a huge population size out there right now."

The research represents the largest peer-reviewed study of SARS-CoV-2 genome sequences in one metropolitan region of the United States.

The study is published in the journal <a href="https://mbio.asm.org/">mBio</a>.

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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

A mutation made the coronavirus more contagious

Researchers at the University of Texas at Austin report that...

Environmental degradation will usher in an era of pandemics in which pandemics will occur more frequently, spread faster, kill more people, and will do even more damage to the global economy than <a href="http://www.earth.com/news/air-pollution-has-increased-covid-19-deaths-by-at-least-15-percent/">COVID-19</a> unless dramatic changes are made soon. Some of the biggest risk factors include the wildlife trade and deforestation, according to a new report released by the <a href="https://ipbes.net/">Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services</a> (IPBES).

The research was conducted by 22 leading experts from all over the world. After analyzing the link between environmental and increasing pandemic risks, the team agrees that it is still possible to avoid an "era of pandemics," but it will require transformative changes in the global strategies used for prevention and response.

COVID-19 is the sixth global health pandemic since the Great Influenza Pandemic of 1918. Even though the virus originated in animals, the outbreak has been entirely driven by human activities, according to the IPBES report.

There are currently an estimated 1.7 million "undiscovered" viruses present in mammals and birds. Of these mysterious viruses, up to 850,000 may have the ability to infect people.

"There is no great mystery about the cause of the COVID-19 pandemic - or of any modern pandemic," said Dr. Peter Daszak, President of EcoHealth Alliance. "The same human activities that drive climate change and biodiversity loss also drive pandemic risk through their impacts on our environment." 

"Changes in the way we use land; the expansion and intensification of agriculture; and unsustainable trade, production and consumption disrupt nature and increase contact between wildlife, livestock, pathogens and people. This is the path to pandemics."

The risk of pandemics can be reduced by slowing the human activities that drive biodiversity loss and greater conservation of protected areas.

The likely cost of COVID-19 is expected to reach up to $16 trillion globally by July 2020. By the end of 2021, costs could reach the same amount in the United States alone. The experts estimate that the cost of preventing pandemics is 100 times less than the cost of responding to pandemics.

"The overwhelming scientific evidence points to a very positive conclusion. We have the increasing ability to prevent pandemics - but the way we are tackling them right now largely ignores that ability," said  Dr. Daszak. 

"Our approach has effectively stagnated - we still rely on attempts to contain and control diseases after they emerge, through vaccines and therapeutics. We can escape the era of pandemics, but this requires a much greater focus on prevention in addition to reaction."

"The fact that human activity has been able to so fundamentally change our natural environment need not always be a negative outcome. It also provides convincing proof of our power to drive the change needed to reduce the risk of future pandemics - while simultaneously benefiting conservation and reducing climate change."

The full report from IPBES is available <a href="https://ipbes.net/pandemics">here</a>. 

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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

&nbsp;

Environmental degradation could push us into an era of pandemics

Environmental degradation will usher in an era of pandemics in...

Ecology researchers at <a href="https://www.flinders.edu.au/">Flinders University</a> have discovered two Australian bee species that forage in the dark. This is the first time that bees have been found to adapt their <a href="http://www.earth.com/news/exercise-can-reduce-or-prevent-vision-loss/">vision</a> to become active at night and during twilight hours.  

The experts observed night-time foraging by nomiine bees and masked bees. Both species developed enlarged compound eyes and simple eyes that allow more light to be gathered.

The image processing ability of bees can be observed using close-up images with a high resolution. According to the researchers, improved low-light ability may exist in other Australian bee species that are secretly active at night. 

Study lead author James Dorey said the nomiine and masked bees are mostly found in Australia's tropical north, but there could potentially be more in subtropical or even temperate conditions across the continent.

"We have confirmed the existence of at least two crepuscular bee species in Australia and there are likely to be many more that can forage both during the day and into the early morning or evening under low light conditions. It's true that bees aren't generally known to be very capable when it comes to using their eyes at night, but it turns out that low-light foraging is more common than currently thought," said Dorey.

"Before this study, the only way to show that a bee had adapted to low-light was by using difficult-to-obtain behavioural observations, but we have found that you should be able to figure this out by using high-quality images of a specific bee."

Dorey pointed out that bees which forage during dim-light conditions are understudied, so there are no reliable published records for any such Australian species.

"Our study provides a framework to help identify low-light-adapted bees and the data that is needed to determine the behavioural traits of other species. This is important as we need to increase efforts to collect bee species outside of normal hours and publish new observations to better understand the role that they play in maintaining ecosystems."

The researchers emphasized that understanding more about the behavior of bee species will help inform strategies to protect them from the impacts of climate change.

"Global weather patterns are changing and temperatures in many parts of Australia are rising along with the risk of prolonged droughts and fires. So, we have to improve our understanding about insects pollinating at night or in milder parts of the day to avoid potential extinction risks or to mitigate loss of pollination services."

"This also means we have to highlight the species that operate in a narrow window of time and could be sensitive to climatic changes, so conservation becomes an important concern. Because quite frankly, we have ignored these species up until now."

The study is published in the <a href="https://jhr.pensoft.net/">Journal of Hymenoptera Research</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Australian bees adapted their vision to forage at night

Ecology researchers at Flinders University have discovered two Australian bee...

Plankton began hunting their own food to survive a mass extinction event. Researchers at the <a href="https://www.southampton.ac.uk/">University of Southampton</a> have discovered that microscopic <a href="http://www.earth.com/news/algae-fungi-first-terrestrial-plants/">algae</a> turned to hunting to survive a mass extinction event. Before an asteroid impact 66 million years ago, nannoplankton relied exclusively on energy from the sun. But then, after three-quarters of life on Earth was wiped out, the remaining nannoplankton were capable of capturing food and eating it.

The research suggests that when sunlight was unavailable, some species were killed while others evolved and adapted. 

In collaboration with experts at UCL and in Paris, California, Bristol, and Edinburgh, the researchers analyzed an exceptional record of plankton fossils. They used eco-evolutionary modeling techniques to examine how organisms behaved before and after the asteroid impact and to understand why some survived and some did not.

The international team had a breakthrough when they noticed that the anatomy of many of the nannoplankton skeletons had changed after the extinction event. These skeletons contained a large hole which represented the position of flagella, tiny tail-like structures used for movement and feeding. This discovery indicated that nannoplankton which survived the asteroid strike were capable of hunting and ingesting food.

"Those species that were lost at the mass extinction show no evidence of a mixotrophic lifestyle and were likely to be completely reliant on sunlight and photosynthesis," said study co-author Dr. Samantha Gibbs. 

"Fossils following the Cretaceous-Paleogene (K-Pg) extinction show that mixotrophy dominated and our model indicates this is because of the exceptional abundance of small prey cells - most likely surviving bacteria - and reduced numbers of larger 'grazers' in the post-extinction oceans."

As a result of environmental changes, nannoplankton gradually shifted back to relying on photosynthesis. Today, most open ocean nannoplankton use only photosynthesis.

The asteroid impact, which formed the Chicxulub crater in Mexico, is most famous for killing off the dinosaurs. The K-Pg extinction event occurred after sunlight was blocked out.

"This huge impact flung vast amounts of debris, aerosols and soot into the atmosphere, causing darkness, cooling and acidification over days and years," said study co-author Professor Paul Bown. "The significant bias found in the nannoplankton extinctions - removal of open-ocean photoautotrophs but survival of mixotrophs that could hunt and feed - can only be fully explained by the darkness caused by the asteroid impact acting as a kill mechanism."

"This 'blackout' or shutdown of primary productivity would have been felt across all of Earth's ecosystems and reveals that the K/Pg event is distinct from all other mass extinctions that have shaped the history of life, both in its rapidity, related to an instantaneous impact event, and its darkness kill mechanism, which shook the foundations of the food chains," explained Dr. Gibbs. "The K/Pg boundary event likely represents the only truly geologically instantaneous mass extinction event."

The study is published in the journal <a href="https://advances.sciencemag.org/">Science Advances</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Plankton began hunting their own food to survive a mass extinction event

Plankton began hunting their own food to survive a mass...

Two groups of Chinook salmon in northern California that have distinctly different migratory patterns are often considered to be separate species. But now, a new study from <a href="https://www.ucsc.edu/">UC Santa Cruz</a> reveals that seemingly complex differences in these salmon can be traced to one simple region of <a href="http://www.earth.com/news/frogs-thought-to-be-extinct-have-been-detected-using-environmental-dna/">DNA</a>.

Chinook salmon within a drainage basin like the Klamath River are characterized as separate ecotypes depending on whether they migrate during spring runs or fall runs. Scientists expected that these groups had diverged from one another due to a lack of interbreeding, resulting in complex genetic differences. 

The new study shows that the salmon do not have complex genetic differences after all, and are all part of a single diverse population. The only DNA that they do not share is a small genomic region that was found to be strongly associated with run timing, but not with other traits like development.

"It's like blue and brown eye color in humans - it just depends on what genotype you inherit from your parents," said study co-author Professor John Carlos Garza. He noted that the outcome of the research is very good news. 

The findings provide scientists with a new way to understand salmon ecotypes and will ultimately help in the management and conservation of Chinook salmon, the largest species of salmon. 

For the investigation, the experts sequenced the complete genomes of 160 Chinook salmon from the Klamath River and Sacramento River drainages. The only consistent differences between spring-run and fall-run fish were found within a single region on chromosome 28. Here, they identified a shorter "Region of Strongest Association" (RoSA) that occurs in two versions, "E" for early migration and "L" for late migration.

Next, the researchers sampled 502 Chinook salmon harvested by the Yurok Tribe in the Klamath River Estuary. There was no overlap in the timing of migration for fish with the "homozygous" EE and LL genotypes. EE fish migrate in the spring, and LL fish migrate in the fall. Fish with the "heterozygous" EL genotype had intermediate migration times, overlapping with those of the homozygous genotypes. 

According to Professor Garza, these results show that seasonal differences in migration are completely attributable to the RoSA genetic variants. "That was an extraordinary finding. I know of no other gene region that so completely determines a complex migratory behavior in the wild in a vertebrate."

The discovery is particularly surprising because of the differences among spring-run and fall-run salmon in their fat content and other features. But in fact, said Professor Garza, all those differences are tied to the timing of migration as determined by the RoSA genotype.

"Spring-run and fall-run fish all start maturing at the same time in the ocean, but during that period after the spring run enters freshwater, they experience different environmental conditions, leading to differences in where and when they spawn," said Professor Garza. "Also, people notice differences in fat content and body condition because they are encountering spring-run fish earlier in the maturation process than fall-run fish."

The analysis of carcasses from the Salmon River, a major tributary of the Klamath, revealed that the spring-run and fall-run salmon were freely interbreeding. 

"It's hard to come up with any scenario where you could classify individuals from the same nest as belonging to different populations," said Professor Garza. "For me, one of the underlying messages is that, in our attempt to categorize things, we've overlooked the fact that these are fundamentally the same animal."

The study is published in the journal <a href="https://www.sciencemag.org/">Science</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

&nbsp;

Distinctly different Chinook salmon are part of the same population

Two groups of Chinook salmon in northern California that have...

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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



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.

Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" 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 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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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.

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

[sendtonews key="QGPzYnXEtN-1712599-12187" type="single"] Today’s Video of the Day from Carl...

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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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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.

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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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.

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



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.

Interactive map of the universe includes 200,000 galaxies

[sendtonews key="e4ZG0Jawp3-2374785-12187" type="single"] Astronomers at Johns Hopkins University have created...

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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



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.

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



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.

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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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.

The rapid retreat of the Columbia Glacier

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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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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.

The Pyrenees Mountains in southwest Europe

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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



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.

How the immune system responds to injury

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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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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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2022 illustrated the consequences of a warming climate

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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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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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Two distant planets may be "water worlds"

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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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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.

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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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.

Tiger sharks are shifting poleward as temperatures rise

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