Scientists have uncovered an intriguing tale of galactic growth, featuring mysterious “red monsters” that are revealing new secrets of the young universe.



An international team of experts led by the University of Geneva (UNIGE) has discovered three ultra-massive galaxies - each almost as substantial as the Milky Way - that emerged within the first billion years following the Big Bang.



<h2 class="wp-block-heading" id="h-theory-of-galaxy-formation">Theory of galaxy formation</h2>



This discovery surprised scientists because it challenges the popular theory of galaxy formation. According to current models, galaxies grow slowly within large halos of dark matter. 



These halos, which are invisible structures, pull in gas that eventually forms stars. Traditionally, scientists believed only about 20% of this gas would turn into stars in these galaxies.



However, the findings from the UNIGE team show that these early massive galaxies were exceptionally efficient at creating stars. They produced stars much faster and in larger numbers than expected, growing at an extraordinary rate compared to galaxies that formed later. 



This unexpected efficiency suggests that early galaxies grew in ways scientists hadn’t previously considered, prompting a rethink of <a href="https://www.earth.com/news/ancient-galaxies-formed-from-the-earliest-elements-in-the-universe/" target="_blank" rel="noreferrer noopener">galaxy formation theories</a>.



<h2 class="wp-block-heading" id="h-the-three-red-monsters">The three "red monsters"</h2>



The James Webb Space Telescope's FRESCO program made this remarkable discovery possible.



The beauty of the FRESCO program lies in its cutting-edge tool, the NIRCam/grism spectrograph, which enables accurate measurement of the distance and stellar masses of <a href="https://www.earth.com/news/early-galaxy-formation-occurred-much-faster-than-we-thought/" target="_blank" rel="noreferrer noopener">galaxies</a>.



Thanks to the superior capabilities of <a href="https://science.nasa.gov/mission/webb/" target="_blank" rel="noreferrer noopener">JWST</a>, astronomers have been able to study galaxies in the distant and early universe systematically - including massive and dust-obscured galaxies.



Upon examining the galaxies in the FRESCO survey, most galaxies conformed to existing models. Yet, the team found three galaxies that were surprisingly massive.



Due to their high dust content, which gives them a unique red appearance in JWST images, the giant galaxies are now known as the "red monsters."



<h2 class="wp-block-heading" id="h-unveiling-the-hidden-red-monsters">Unveiling the hidden red monsters</h2>



Dr. Mengyuan Xiao, the lead author of the study, is a postdoctoral researcher in the Department of Astronomy at <a href="https://www.unige.ch/en/" target="_blank" rel="noreferrer noopener">UNIGE</a> Faculty of Science.



Dr. Xiao joined forces with Dr. David Elbaz, director of research at CEA Paris-Saclay, to investigate the red monsters.



“Our findings are reshaping our understanding of galaxy formation in the early universe,” noted Dr. Xiao.



“The massive properties of these red monsters were hardly determined before JWST, as they are optically invisible due to dust attenuation,” said Dr. Elbaz.



<h2 class="wp-block-heading" id="h-studying-the-growth-of-galaxies-over-time">Studying the growth of galaxies over time</h2>



Using the James Webb telescope, the researchers developed an innovative program which enables the systematic analysis of a complete sample of emission-line galaxies within the first billion years of <a href="https://www.earth.com/news/milky-way-like-galaxies-were-present-in-the-early-universe/" target="_blank" rel="noreferrer noopener">cosmic history</a>.



This program allowed the team to achieve precise distance estimates and reliable stellar mass measurements for the full galaxy sample.



Pascal Oesch is an associate professor in the Department of Astronomy at the UNIGE and principal investigator of the observation program.



“Our findings highlight the remarkable power of NIRCam/grism spectroscopy," noted Oesch. "The instrument on board the space telescope allows us to identify and study the growth of galaxies over time, and to obtain a clearer picture of how stellar mass accumulates over the course of cosmic history.”



<h2 class="wp-block-heading" id="h-too-many-too-massive-galaxies">"Too many, too massive" galaxies</h2>



The discovery of these massive galaxies challenges existing ideas about how galaxies form.



The findings highlight the presence of an unexpectedly high number of large galaxies - "too many, too massive" galaxies - very early in the universe’s history.



This suggests that existing models may be missing certain processes or factors that allowed some galaxies to grow rapidly right after the Big Bang.



<h2 class="wp-block-heading" id="h-future-research-directions">Future research directions</h2>



To understand these giant galaxies better, scientists will continue observing them with powerful instruments like JWST and ALMA.



These tools can offer more detailed views and help find more of these ultra-massive galaxies, deepening our understanding of galaxy formation in the early universe and potentially revising the models of cosmic evolution.



Future endeavors hold the promise of addressing lingering questions about the universe’s dark matter content, stellar formation processes, and the dynamic behavior of galaxies over cosmic time scales.



<h2 class="wp-block-heading" id="h-significance-of-the-red-monsters">Significance of the red monsters</h2>



The discoveries with JWST have significantly contributed to our understanding of cosmic origins, particularly by offering new perspectives on the <a href="https://www.earth.com/news/galaxies-like-our-own-milky-way-are-not-unique/" target="_blank" rel="noreferrer noopener">early universe</a>.



These revelations challenge the existing paradigms of universe evolution, suggesting that even in the nascent stages following the Big Bang, there existed environments ripe for the rapid growth and formation of the red monsters.



“These results indicate that galaxies in the early universe could form stars with unexpected efficiency," said Dr. Xiao.



"As we study these galaxies in more depth, they will offer new insights into the conditions that shaped the universe’s earliest epochs. The red monsters are just the beginning of a new era in our exploration of the early universe."



The study is published in the journal <a href="https://www.nature.com/articles/s41586-024-08094-5" target="_blank" rel="noreferrer noopener">Nature</a>.



Image Credit: NASA / CSA / ESA / M. Xiao &amp; P. A. Oesch / G. Brammer / Dawn JWST Archive



-----



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-----

'Red monsters' challenge what we know about the early universe

Scientists have uncovered an intriguing tale of galactic growth, featuring mysterious “red monsters” that are revealing new secrets of the young universe. An international team of experts led by the University of Geneva (UNIGE) has discovered three ultra-massive galaxies - each almost as substantial as the Milky Way - that emerged within the first billion years following the Big Bang. Theory of galaxy formation This discovery surprised scientists because it challenges the popular theory of galaxy formation. According to current models, galaxies grow slowly within large halos...

Study: Global Warming Could Still Be Limited To Only 2 Degrees Celsius.They study conclude that effectively limiting climate change is possible if a major economy acts as a forerunner, while other nations follow -- and, importantly, by doing so they do not have to agree on common criteria for fairness.

"If either the European Union or the US would pioneer and set a benchmark for climate action by others, the negotiation logjam about fair burden sharing could be broken," lead author Malte Meinshausen from the Potsdam Institute for <a href="https://www.earth.com/news/experts-have-outlined-the-top-ten-climate-insights-of-2020/">Climate</a> Impact Research and the University of Melbourne says. "Our analysis shows that they would have to roughly double their current domestic 2030 emissions reductions targets -- which would certainly require substantial efforts. Yet it seems to be one of the few options to stay on track for eventually limiting warming below 2 degrees <a href="https://www.bing.com/search?q=Celsius&amp;cvid=9c83945212f34c8faaffc7c3fe8ecf3c&amp;FORM=ANAB01&amp;PC=HCTS">Celsius</a> and fend off a drastic increase of weather extremes and sea-level rise.Study: Global Warming Could Still Be Limited To Only 2 Degrees Celsius

Two conflicting fairness criteria must be dealt with

While the UN Climate Change Convention holds up the formula of 'common but differentiated responsibility', the world is currently divided into two main camps, simply speaking. One is in favor of distributive justice at some point in the future: emissions per person would be roughly same in every country by 2050. This includes the EU and the USA. The other camp, with China and India, calls for corrective justice: the emissions of the past should be taken into account to achieve equal cumulative emissions per person. This kind of fairness scheme would mean that those that emitted less in the past can emit more in the future on a per-capita basis.

Analyses of emissions reduction pledges and past negotiations show that, unsurprisingly, countries tend to adhere to the allocation principle which allows them to least reduce emissions, compared to their international competitors. Since China and India industrialized only recently, in the past they emitted less than the EU and the US did. Yet today China emits more than the EU and US combined on an absolute basis, and about the same as the EU on a per-capita basis.

'This seems less utopian than a uniform regulation'

"Now we have calculated how much a major economy would have to cut its greenhouse gas output if all the other countries would follow the emissions allocation scheme that is most favourable to them -- so some base their reduction number on the equal per capita scheme, others include the historical emissions, and still the 2-degree limit is met," says co-author Louise Jeffery from the Potsdam Institute. The scientists call this concept diversity-aware leadership. "This seems less utopian than a uniform regulation," says Jeffery. "But it builds on the assumption that most economically relevant countries participate in one way or another and ensures that the global efforts are successful in limiting warming to 2°C."

In this scenario, the US national emissions reduction target would have to be roughly 50 percent instead of currently 22-24 percent below 2010 levels by 2030. Alternatively, the equivalent target for the EU would have to be about minus 60 percent instead of currently 27 percent below 2010 (27% below 2010 being equal to the announced 40% below 1990 target).

It's in the numbers: China will not take the lead

China could also take the lead, but beyond political considerations already the numbers show that this is unlikely. In fact, the quantification of the Chinese pledge indicates the largest gap between a leadership target and a currently proposed peaking by 2030. If China wanted to assume leadership, China would have to reduce emissions by 32 percent below 2010 levels by 2030. In a scenario of equalized cumulative per-capita emissions, it would only need to reduce them by 4 percent. This seems little, but would in fact be a most crucial contribution.

"If you look at what pledges the countries put on the table for Paris so far, it's clearly not enough to keep warming within the internationally agreed 2-degree limit -- hence the current 'intended nationally determined contributions' can only be regarded as a first step in the right direction," says co-author Sebastian Oberthuer from Vrije Universiteit Brussel. Based on IPCC databases, the scientists derived their proposition which is contrary to previous assumptions about allocation schemes. "If we postpone action until we have universal agreement on a fair allocation of emissions reductions," he says, "the result will be fair only in that everybody will lose -- because climate change will hit us all."

"Our study thus anticipates the upcoming Paris climate summit, which will see countries make their mitigation contributions in an independent bottom-up manner," says Joeri Rogelj from the International Institute for Applied Systems Analysis. "This is a fundamental break with the past," he says, "and in this new landscape, our study introduces an important new concept which helps us understand how major countries can still assume a leadership role on this highly fragmented playing field.

---

<a href="http://www.iiasa.ac.at/" target="_blank" rel="noopener">http://www.iiasa.ac.at/</a>

&nbsp;

Study: Global Warming Could Still Be Limited To Only 2 Degrees Celsius

Study: Global Warming Could Still Be Limited To Only 2...

Study: Only 4 Percent Of The Ocean Is Protected. Despite global efforts to increase the area of the ocean that is protected, only four percent of it lies within marine protected areas (MPAs), according to a University of British Columbia study.

UBC Institute for Ocean and Fisheries researchers found that major swaths of the ocean must still be protected to reach even the most basic global targets.

In 2010, representatives from nearly 200 countries met in Nagoya, <a href="http://www.earth.com/video/sea-walls-help-protect-japan-from-tsunamis/">Japan,</a> and adopted the United Nations' Aichi Targets, in a bid to stem the rapid loss of biodiversity. The countries committed to protecting at least 10 per cent of the ocean by 2020.

"The targets call for much more than just 10 per cent protection," said lead author Lisa Boonzaier. "They require that protected areas be effectively and equitably managed, ecologically representative and well-connected, all of which will help to ensure that MPAs contribute to more than percentage targets and meet the goal of conserving biodiversity."

Boonzaier believes that not only do countries need to create more MPAs, they need to improve the protection they afford biodiversity by making a greater percentage of them no-take and enforcing them as such.

"No-take" marine protected areas are zones where it is prohibited to extract any resources, including living resources, such as fish, crustaceans, and seaweed, and non-living resources, such as oil and gas. Only 16 per cent of the area that is protected or 0.5 per cent of the global ocean--is designated as "no take."

However, the past decade has seen improvement. In 2006, only an estimated 0.65 per cent of the ocean was protected.

"Given the creation of very large marine protected areas in recent years, notably though the Global Ocean Legacy Project of the Pew Charitable Trusts, there is a chance that the Aichi Targets can be reached, which would be a major achievement," said co-author Daniel Pauly, a professor at the Institute for Ocean and Fisheries.

---

<a href="http://www.ubc.ca/" target="_blank" rel="noopener noreferrer">University of British Columbia</a>

Study: Only 4 Percent Of The Ocean Is Protected

Study: Only 4 Percent Of The Ocean Is Protected. Despite...

Carbon Dioxide

Republican Congress Moves To Block Obama's Clean Power Plan. Congressional Republicans are moving to block President Barack Obama's clean power plan to force steep cuts in greenhouse gas emissions from U.S. power plants.
Senate Majority Leader Mitch McConnell and Rep. Ed Whitfield say they will file resolutions early this week opposing Obama's plan to impose new regulations on new and existing coal-fired plants.
The two Kentucky Republicans were expected to file the challenges filed under the little-used Congressional Review Act, which allows Congress to block executive actions with simply majority votes. The maneuver is subject to a presidential veto and has rarely been successful in overturning executive branch rules.
Still, it allows opponents to set up votes calculated to embarrass the Obama administration ahead of international climate talks in Paris this fall.
Republican senators are expected to tout the congressional challenge in a series of floor speeches starting Tuesday. One notable exception is New Hampshire Sen. Kelly Ayotte, who became the first GOP senator to support Obama's sweeping regulation that mandates carbon emissions cuts from the nation's power plants.
Ayotte, who is locked in a difficult re-election fight, said Sunday that the Clean Power Plan would "address climate change through <a href="http://www.earth.com/news/clean-energy-should-be-prioritized-during-covid-19-recovery/">clean-energy</a> solutions that will protect our environment."
New Hampshire is already well on its way to meet the plans' goals, Ayotte said, adding that she would monitor the plan to ensure it does not have an adverse impact on state energy costs.
McConnell said in a statement that the regulations being imposed under the Clean Power Plan "make it clearer than ever that the president and his administration have gone too far - and that Congress should act to stop this regulatory assault."
The administration's "crusade for ideological purity" threatens the livelihoods of coal miners and their families in Kentucky and other states, McConnell said. Republican Congress Moves To Block Obama's Clean Power Plan
"These are Kentuckians who just want to work, provide for their families and deliver the type of low-cost energy that attracts more jobs to Kentucky. And coal is what allows so many of them do all that," he said.
The congressional resolutions follow court challenges filed Friday by industry groups and states dependent on fossil fuels. The challenges from all but two of the 25 states were filed by Republicans. They deride the plan as an "unlawful power grab by Washington bureaucrats" that will kill coal mining jobs and drive up electricity costs.
The Obama administration and environmental groups counter that the rules are needed to cut carbon emissions while curbing the worst impacts of climate change and sea-level rise. They also say the plan will spur new clean-energy jobs.
The new rules require states to cut carbon emissions by 32 percent by 2030, based on emissions in 2005. Each state has a customized target and is responsible for drawing up an effective plan to meet its goal.
The EPA says it has authority to enact the plan under the Clean Air Act.
Follow Matthew Daly: <a href="http://twitter.com/MatthewDalyWDC" target="_blank" rel="noopener noreferrer">http://twitter.com/MatthewDalyWDC</a>
© 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.

Republican Congress Moves To Block Obama's Clean Power Plan

Republican Congress Moves To Block Obama's Clean Power Plan. Congressional...

Study: Global Warming Could Still Be Limited To Only 2 Degrees Celsius. Study: Global Warming Could Still Be Limited To Only 2 Degrees Celsius. They study conclude that effectively limiting climate change is possible if a major economy acts as a forerunner, while other nations follow -- and, importantly, by doing so they do not have to agree on common criteria for fairness.

"If either the European Union or the US would pioneer and set a benchmark for <a href="http://www.earth.com/news/great-tits-can-adapt-to-climate-change-but-only-to-a-point/">climate</a> action by others, the negotiation logjam about fair burden sharing could be broken," lead author Malte Meinshausen from the Potsdam Institute for Climate Impact Research and the University of Melbourne says. "Our analysis shows that they would have to roughly double their current domestic 2030 emissions reductions targets -- which would certainly require substantial efforts. Yet it seems to be one of the few options to stay on track for eventually limiting warming below 2 degrees Celsius and fend off a drastic increase of weather extremes and sea-level rise."

Two conflicting fairness criteria must be dealt with

While the UN Climate Change Convention holds up the formula of 'common but differentiated responsibility', the world is currently divided into two main camps, simply speaking. One is in favor of distributive justice at some point in the future: emissions per person would be roughly same in every country by 2050. This includes the EU and the USA. The other camp, with China and India, calls for corrective justice: the emissions of the past should be taken into account to achieve equal cumulative emissions per person. This kind of fairness scheme would mean that those that emitted less in the past can emit more in the future on a per-capita basis.

Analyses of emissions reduction pledges and past negotiations show that, unsurprisingly, countries tend to adhere to the allocation principle which allows them to least reduce emissions, compared to their international competitors. Since China and India industrialized only recently, in the past they emitted less than the EU and the US did. Yet today China emits more than the EU and US combined on an absolute basis, and about the same as the EU on a per-capita basis.

'This seems less utopian than a uniform regulation'

"Now we have calculated how much a major economy would have to cut its greenhouse gas output if all the other countries would follow the emissions allocation scheme that is most favourable to them -- so some base their reduction number on the equal per capita scheme, others include the historical emissions, and still the 2-degree limit is met," says co-author Louise Jeffery from the Potsdam Institute. The scientists call this concept diversity-aware leadership. "This seems less utopian than a uniform regulation," says Jeffery. "But it builds on the assumption that most economically relevant countries participate in one way or another and ensures that the global efforts are successful in limiting warming to 2°C."

In this scenario, the US national emissions reduction target would have to be roughly 50 percent instead of currently 22-24 percent below 2010 levels by 2030. Alternatively, the equivalent target for the EU would have to be about minus 60 percent instead of currently 27 percent below 2010 (27% below 2010 being equal to the announced 40% below 1990 target).

It's in the numbers: China will not take the lead

China could also take the lead, but beyond political considerations already the numbers show that this is unlikely. In fact, the quantification of the Chinese pledge indicates the largest gap between a leadership target and a currently proposed peaking by 2030. If China wanted to assume leadership, China would have to reduce emissions by 32 percent below 2010 levels by 2030. In a scenario of equalized cumulative per-capita emissions, it would only need to reduce them by 4 percent. This seems little, but would in fact be a most crucial contribution.

"If you look at what pledges the countries put on the table for Paris so far, it's clearly not enough to keep warming within the internationally agreed 2-degree limit -- hence the current 'intended nationally determined contributions' can only be regarded as a first step in the right direction," says co-author Sebastian Oberthuer from Vrije Universiteit Brussel. Based on IPCC databases, the scientists derived their proposition which is contrary to previous assumptions about allocation schemes. "If we postpone action until we have universal agreement on a fair allocation of emissions reductions," he says, "the result will be fair only in that everybody will lose -- because climate change will hit us all."

"Our study thus anticipates the upcoming Paris climate summit, which will see countries make their mitigation contributions in an independent bottom-up manner," says Joeri Rogelj from the International Institute for Applied Systems Analysis. "This is a fundamental break with the past," he says, "and in this new landscape, our study introduces an important new concept which helps us understand how major countries can still assume a leadership role on this highly fragmented playing field.

---

<a href="http://www.iiasa.ac.at/" target="_blank" rel="noopener noreferrer">http://www.iiasa.ac.at/</a>

&nbsp;

Ancient Permafrost Quickly Transforms To Carbon Dioxide Upon Thawing. Researchers from the U.S. Geological Survey and key academic partners including the University of Colorado Boulder have quantified how rapidly ancient permafrost decomposes upon thawing and how much carbon dioxide is produced in the process.

Huge stores of organic carbon in permafrost soils -- frozen for hundreds to tens of thousands of years across high northern latitudes worldwide -- are currently isolated from the modern day carbon cycle. However, if thawed by changing climate conditions, wildfire, or other disturbances, this massive carbon reservoir could decompose and be emitted as the greenhouse gases carbon dioxide and methane, or be carried as dissolved organic carbon to streams and rivers.

"Many scientists worldwide are now investigating the complicated potential end results of thawing permafrost," said Rob Striegl, USGS scientist and study co-author. "There are critical questions to consider, such as: How much of the stored permafrost carbon might thaw in a future climate? Where will it go? And, what are the consequences for our climate and our aquatic ecosystems?"

At a newly excavated tunnel operated by the U.S. Army Corps of Engineers near Fairbanks, Alaska, a research team from USGS, CU-Boulder and and Florida State University set out to determine how rapidly the dissolved organic carbon from ancient (about 35,000 years old) "yedoma" soils decomposes upon soil thaw and how much carbon dioxide is produced.

Yedoma is a distinct type of permafrost soil found across Alaska and Siberia that accounts for a significant portion of the permafrost soil carbon pool. These soils were deposited as wind-blown silts in the late Pleistocene age and froze soon after they were formed.

"It had previously been assumed that permafrost soil carbon this old was already degraded and not susceptible to rapid decomposition upon thaw," said Kim Wickland, the USGS scientist who led the team.

The researchers found that more than half of the dissolved organic carbon in yedoma permafrost was decomposed within one week after thawing. About 50 percent of that carbon was converted to carbon dioxide, while the rest likely became microbial <a href="http://www.earth.com/news/woody-biomass-neutral/">biomass</a>.

"What this study adds is that we show what makes permafrost so biodegradable," said Travis Drake, the lead author of the research. "Immediately upon thaw, microbes start using the carbon and then it is sent back into the atmosphere." Drake was both a USGS employee and a master's degree student at CU-Boulder during the investigation.

The researchers attribute this rapid decomposition to high concentrations of low molecular weight organic acids in the dissolved organic carbon, which are known to be easily degradable and are not usually present at high concentrations in other soils.

These rates are among the fastest permafrost decomposition rates that have been documented. It is the first study to link rapid microbial consumption of ancient permafrost soil-derived dissolved organic carbon to the production of carbon dioxide.

An important implication of the study for aquatic ecosystems is that dissolved organic carbon released by thawing yedoma permafrost will be quickly converted to carbon dioxide and emitted to the atmosphere from soils or small streams before it can be transported to major rivers or coastal regions.

---

<a href="http://www.colorado.edu" target="_blank" rel="noopener noreferrer">University of Colorado Boulder</a>

Ancient Permafrost Quickly Transforms To Carbon Dioxide Upon Thawing

Ancient Permafrost Quickly Transforms To Carbon Dioxide Upon Thawing. Researchers...

Republican Congress Moves To Block Obama's Clean Power Plan. Congressional Republicans are moving to block President Barack Obama's clean power plan to force steep cuts in greenhouse gas emissions from U.S. power plants.
Senate Majority Leader Mitch McConnell and Rep. Ed Whitfield say they will file resolutions early this week opposing Obama's plan to impose new regulations on new and existing coal-fired plants.
The two Kentucky Republicans were expected to file the challenges filed under the little-used Congressional Review Act, which allows <a href="http://www.earth.com/news/congress-moves-again-to-prevent-obama-from-protecting-water-quality/">Congress</a> to block executive actions with simply majority votes. The maneuver is subject to a presidential veto and has rarely been successful in overturning executive branch rules.Republican Congress Moves To Block Obama's Clean Power Plan
Still, it allows opponents to set up votes calculated to embarrass the Obama administration ahead of international climate talks in Paris this fall.
Republican senators are expected to tout the congressional challenge in a series of floor speeches starting Tuesday. One notable exception is New Hampshire Sen. Kelly Ayotte, who became the first GOP senator to support Obama's sweeping regulation that mandates carbon emissions cuts from the nation's power plants.
Ayotte, who is locked in a difficult re-election fight, said Sunday that the Clean Power Plan would "address climate change through clean-energy solutions that will protect our environment."
New Hampshire is already well on its way to meet the plans' goals, Ayotte said, adding that she would monitor the plan to ensure it does not have an adverse impact on state energy costs.
McConnell said in a statement that the regulations being imposed under the Clean Power Plan "make it clearer than ever that the president and his administration have gone too far - and that Congress should act to stop this regulatory assault."
The administration's "crusade for ideological purity" threatens the livelihoods of coal miners and their families in Kentucky and other states, McConnell said.
"These are Kentuckians who just want to work, provide for their families and deliver the type of low-cost energy that attracts more jobs to Kentucky. And coal is what allows so many of them do all that," he said.
The congressional resolutions follow court challenges filed Friday by industry groups and states dependent on fossil fuels. The challenges from all but two of the 25 states were filed by Republicans. They deride the plan as an "unlawful power grab by Washington bureaucrats" that will kill coal mining jobs and drive up electricity costs.
The Obama administration and environmental groups counter that the rules are needed to cut carbon emissions while curbing the worst impacts of climate change and sea-level rise. They also say the plan will spur new clean-energy jobs.
The new rules require states to cut carbon emissions by 32 percent by 2030, based on emissions in 2005. Each state has a customized target and is responsible for drawing up an effective plan to meet its goal.
The EPA says it has authority to enact the plan under the Clean Air Act.
Follow Matthew Daly: <a href="http://twitter.com/MatthewDalyWDC" target="_blank" rel="noopener noreferrer">http://twitter.com/MatthewDalyWDC</a>
© 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.

Ancient Permafrost Quickly Transforms To Carbon Dioxide Upon Thawing. Researchers from the U.S. Geological Survey and key academic partners including the University of Colorado <a href="http://www.earth.com/news/western-u-s-wildfires-will-increase-the-threat-of-dangerous-debris-flows/">Boulder</a> have quantified how rapidly ancient permafrost decomposes upon thawing and how much carbon dioxide is produced in the process.

Huge stores of organic carbon in permafrost soils -- frozen for hundreds to tens of thousands of years across high northern latitudes worldwide -- are currently isolated from the modern day carbon cycle. However, if thawed by changing climate conditions, wildfire, or other disturbances, this massive carbon reservoir could decompose and be emitted as the greenhouse gases carbon dioxide and methane, or be carried as dissolved organic carbon to streams and rivers.

"Many scientists worldwide are now investigating the complicated potential end results of thawing permafrost," said Rob Striegl, USGS scientist and study co-author. "There are critical questions to consider, such as: How much of the stored permafrost carbon might thaw in a future climate? Where will it go? And, what are the consequences for our climate and our aquatic ecosystems?"

At a newly excavated tunnel operated by the U.S. Army Corps of Engineers near Fairbanks, Alaska, a research team from USGS, CU-Boulder and and Florida State University set out to determine how rapidly the dissolved organic carbon from ancient (about 35,000 years old) "yedoma" soils decomposes upon soil thaw and how much carbon dioxide is produced.

Yedoma is a distinct type of permafrost soil found across Alaska and Siberia that accounts for a significant portion of the permafrost soil carbon pool. These soils were deposited as wind-blown silts in the late Pleistocene age and froze soon after they were formed.

"It had previously been assumed that permafrost soil carbon this old was already degraded and not susceptible to rapid decomposition upon thaw," said Kim Wickland, the USGS scientist who led the team.

The researchers found that more than half of the dissolved organic carbon in yedoma permafrost was decomposed within one week after thawing. About 50 percent of that carbon was converted to carbon dioxide, while the rest likely became microbial biomass.

"What this study adds is that we show what makes permafrost so biodegradable," said Travis Drake, the lead author of the research. "Immediately upon thaw, microbes start using the carbon and then it is sent back into the atmosphere." Drake was both a USGS employee and a master's degree student at CU-Boulder during the investigation.

The researchers attribute this rapid decomposition to high concentrations of low molecular weight organic acids in the dissolved organic carbon, which are known to be easily degradable and are not usually present at high concentrations in other soils. Ancient Permafrost Quickly Transforms To Carbon Dioxide Upon Thawing

These rates are among the fastest permafrost decomposition rates that have been documented. It is the first study to link rapid microbial consumption of ancient permafrost soil-derived dissolved organic carbon to the production of carbon dioxide.

An important implication of the study for aquatic ecosystems is that dissolved organic carbon released by thawing yedoma permafrost will be quickly converted to carbon dioxide and emitted to the atmosphere from soils or small streams before it can be transported to major rivers or coastal regions.

---

<a href="http://www.colorado.edu" target="_blank" rel="noopener noreferrer">University of Colorado Boulder</a>

Coral Damage From BP Gulf Oil Spill Worse Than Previously Thought. Gulf coral damage from the massive BP oil spill is more extensive than previously thought, according to a new study that revealed sick and dying corals in the rich, deep-water <a href="https://www.bing.com/search?q=enviorment&amp;cvid=319258dbcb644718b586066e7c29e4d0&amp;FORM=ANAB01&amp;PC=HCTS">environment</a> off the coasts of Alabama and Mississippi known as the Pinnacles.
Using remotely operated submarines, researchers explored the Pinnacle Reef in September 2011 and found more than 400 coral colonies were injured. <a href="http://www.earth.com/news/the-great-barrier-reef-has-lost-half-its-corals-in-two-decades/">Corals</a> - such as sea whips, sea fans and black corals - were covered in a scum of dead tissues and oily residue. Some showed severe damage, such as bare skeletons and missing branches.Coral Damage From BP Gulf Oil Spill Worse Than Previously Thought
These colonies are found about 35 miles to 68 miles to the north of BP PLC's blown-out well, which spewed more than 130 million gallons of oil into the Gulf of Mexico in 2010. Previous discoveries of coral damage were found south of the BP well and in much deeper water. The coral in the Pinnacles live about 200 feet under the water surface.
The Pinnacles is a rocky outcropping on the Continental Shelf about 70 miles off the coasts of Mississippi and Alabama.
The study was conducted by a team of Florida State University researchers and federal scientists with the National Oceanic and Atmospheric Administration. It was also done as part of the work to assess damage from the spill, the so-called natural resources damage assessment. The study is set to be published in Deep-Sea Research, an oceanography journal.
The paper said the damaged coral showed signs of injury from an "acute, isolated event rather than ongoing natural processes." It based this conclusion on previous explorations that looked at the corals between 1997 and 1999, which found the corals were mostly healthy.
"We saw many injured colonies," said Ian MacDonald, an oceanographer at Florida State University. He is one of the authors of the study.
He believes a much larger area of the Pinnacles most likely suffered similar damage.
"The area we have looked at so far is only the tip of the iceberg," he said.
The researchers believe oil floating over the Pinnacles was sprayed with chemical dispersants, which led to oil sinking and contaminating the reef. The paper also says a tropical storm that passed over the area during summer 2010 churned up the sea and caused oil to reach the corals.
"It is a new region and a new ecosystem showing impact," said Erik Cordes, a deep-sea marine scientist familiar with the Pinnacles Reef study. He's been involved with teams looking at coral damage closer to the site of the BP blowout.
"We'll have to monitor it over time," Cordes said.
Even though more than five years have passed since the spill, scientists are still locked in studies to figure out where the oil went and what effects it had on the Gulf ecosystem.
MacDonald said one way to protect the reef from further damage would be to designate it as a protected marine sanctuary.
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Coral Damage From BP Gulf Oil Spill Worse Than Previously Thought

Coral Damage From BP Gulf Oil Spill Worse Than Previously...

Coral Damage From BP Gulf Oil Spill Worse Than Previously Thought. Gulf coral damage from the massive BP oil spill is more extensive than previously thought, according to a new study that revealed sick and dying corals in the rich, deep-water environment off the coasts of <a href="http://www.earth.com/image/tornado-track-tuscaloosa-alabama/">Alabama</a> and Mississippi known as the Pinnacles.
Using remotely operated submarines, researchers explored the Pinnacle Reef in September 2011 and found more than 400 coral colonies were injured. Corals - such as sea whips, sea fans and black corals - were covered in a scum of dead tissues and oily residue. Some showed severe damage, such as bare skeletons and missing branches. <a href="https://www.bing.com/search?q=coral&amp;cvid=e638910df970478fa44cf0030b081ad9&amp;FORM=ANAB01&amp;PC=HCTS">Coral</a> Damage From BP Gulf Oil Spill Worse Than Previously Thought
These colonies are found about 35 miles to 68 miles to the north of BP PLC's blown-out well, which spewed more than 130 million gallons of oil into the Gulf of Mexico in 2010. Previous discoveries of coral damage were found south of the BP well and in much deeper water. The coral in the Pinnacles live about 200 feet under the water surface.
The Pinnacles is a rocky outcropping on the Continental Shelf about 70 miles off the coasts of Mississippi and Alabama.
The study was conducted by a team of Florida State University researchers and federal scientists with the National Oceanic and Atmospheric Administration. It was also done as part of the work to assess damage from the spill, the so-called natural resources damage assessment. The study is set to be published in Deep-Sea Research, an oceanography journal.
The paper said the damaged coral showed signs of injury from an "acute, isolated event rather than ongoing natural processes." It based this conclusion on previous explorations that looked at the corals between 1997 and 1999, which found the corals were mostly healthy.
"We saw many injured colonies," said Ian MacDonald, an oceanographer at Florida State University. He is one of the authors of the study.
He believes a much larger area of the Pinnacles most likely suffered similar damage.
"The area we have looked at so far is only the tip of the iceberg," he said.
The researchers believe oil floating over the Pinnacles was sprayed with chemical dispersants, which led to oil sinking and contaminating the reef. The paper also says a tropical storm that passed over the area during summer 2010 churned up the sea and caused oil to reach the corals.
"It is a new region and a new ecosystem showing impact," said Erik Cordes, a deep-sea marine scientist familiar with the Pinnacles Reef study. He's been involved with teams looking at coral damage closer to the site of the BP blowout.
"We'll have to monitor it over time," Cordes said.
Even though more than five years have passed since the spill, scientists are still locked in studies to figure out where the oil went and what effects it had on the Gulf ecosystem.
MacDonald said one way to protect the reef from further damage would be to designate it as a protected marine sanctuary.
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Feds: Efforts To Block Greater Sage Grouse Protection Is Dangerous. Attempts by rural Nevada counties, mining companies and others to block new U.S. policies intended to protect the greater sage grouse could backfire on the critics and ultimately force the reconsideration of a recent decision to keep the bird off the list of endangered species, federal land managers warn.
Justice Department lawyers representing three U.S. agencies say it took an unprecedented effort by officials in 11 western states from <a href="https://www.bing.com/search?q=california&amp;cvid=789232de7ee341cda75f43dc3068a27a&amp;FORM=ANAB01&amp;PC=HCTS">California</a> to the Dakotas to persuade the Fish and Wildlife Service last month to reverse its 2010 conclusion that protection of the grouse was warranted under the Endangered Species Act.
The new finding was based on assumptions that added protections in the land-planning amendments being challenged will be carried out to ensure the grouse no longer is threatened with extinction, they said in a brief filed Friday in U.S. District Court in Reno.
Any injunction blocking implementation would "diminish the protections for sage grouse ... undo four years of collaboration and could undermine FWS' finding," U.S. Attorney Daniel Bogden wrote.
U.S. District Judge Miranda Du has set a hearing for Nov. 12 in Reno to consider granting a preliminary injunction blocking the amendments.
Elko and Eureka counties and others filed the lawsuit on Sept. 23 - the day after Interior Secretary Sally Jewell announced the listing decision. The Wyoming Stock Growers Association also is suing in federal court there, and Idaho's governor has signed onto a separate lawsuit filed in federal court in Washington, D.C.
The Nevada lawsuit says the plans could run mining companies and ranchers out of business, block construction of a wind energy project that could bring Elko County $500 million and deny firefighters and law officers access to existing roads during emergencies.
Nevada Attorney General Adam Laxalt added his name to the lawsuit last week - over the objections of Gov. Brian Sandoval - along with Churchill, Humboldt, Lander, Lincoln, Pershing and Washoe counties in the state.
The government, in its first formal response, says the opponents misrepresent and exaggerate the potential effects. It says they have proven no irreparable harm and are challenging prematurely the planning-level amendments that offer guidelines but render no specific decisions on individual grazing, mining or other federal permits.
"They allege speculative injuries that will come to pass, if at all, only after future site-specific decisions are made," Bogden wrote. He especially challenged claims the protections could restrict use of thousands of miles of existing roads and threaten public safety by inhibiting the travel of emergency responders.
"The amendments do not close any existing routes," Bogden wrote. "But even if they did, the agencies' regulations exempt emergency vehicles from OHV (off-highway vehicle) restrictions."
The lawsuit accuses the government of "attempting a massive management change" for more than 20 million acres of public land in Nevada without proper environmental review - nearly 3 million acres where new mining claims are prohibited for at least two years and more than 16 million acres subject to what the lawsuit calls onerous travel restrictions.
The two-year freeze on some new mining claims was triggered by Jewell's proposal last month to withdraw 10 million acres of public lands in Idaho, Montana, Nevada, Oregon, Utah and Wyoming under the 1872 Mining Law, which was passed then to encourage the development of lands in the western U.S.
But Bogden said the proposed withdrawal is subject to "valid existing rights and has no immediate effect on mining operations." It's subject to public comment through Dec. 23.
Likewise, nothing in the guidelines themselves would prevent <a href="http://www.earth.com/news/scientists-reconstruct-66-million-year-record-of-earths-climate/">construction</a> of the $500 million China Mountain Wind Energy Project in Elko County, he said. "Elko's County's speculation that ultimately it will not be approved is not an imminent injury," Bogden said.
The lawsuit says the government inappropriately dismissed Elko County's plan to increase livestock grazing as a way to bolster grouse habitat by slowing the growth of vegetation that fuel wildfires. But Bogden said there is "no scientific evidence to support a correlation between increased grazing and improved sage grouse habitat."Feds: Efforts To Block Greater Sage Grouse Protection Is Dangerous
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Feds: Efforts To Block Greater Sage Grouse Protection Is Dangerous

Feds: Efforts To Block Greater Sage Grouse Protection Is Dangerous....

Coral Damage From BP Gulf Oil Spill Worse Than Previously ThoughtGulf coral damage from the massive BP oil spill is more extensive than previously thought, according to a new study that revealed sick and dying corals in the rich, deep-water environment off the coasts of Alabama and Mississippi known as the Pinnacles.
Using remotely operated submarines, researchers explored the Pinnacle Reef in September 2011 and found more than 400 coral colonies were injured. Corals - such as sea whips, sea fans and black corals - were covered in a scum of dead tissues and oily residue. Some showed severe damage, such as bare skeletons and missing branches. Coral Damage From BP Gulf Oil Spill Worse Than Previously Thought
These colonies are found about 35 miles to 68 miles to the north of BP PLC's blown-out well, which spewed more than 130 million gallons of oil into the Gulf of <a href="http://www.earth.com/news/experts-track-the-flow-of-nutrients-in-the-gulf-of-mexico/">Mexico i</a>n 2010. Previous discoveries of coral damage were found south of the BP well and in much deeper water. The coral in the Pinnacles live about 200 feet under the water surface.
The Pinnacles is a rocky outcropping on the Continental Shelf about 70 miles off the coasts of Mississippi and Alabama.
The study was conducted by a team of Florida State University researchers and federal scientists with the National Oceanic and Atmospheric Administration. It was also done as part of the work to assess damage from the spill, the so-called natural resources damage assessment. The study is set to be published in Deep-Sea Research, an oceanography journal.
The paper said the damaged coral showed signs of injury from an "acute, isolated event rather than ongoing natural processes." It based this conclusion on previous explorations that looked at the corals between 1997 and 1999, which found the corals were mostly healthy.
"We saw many injured colonies," said Ian MacDonald, an oceanographer at Florida State University. He is one of the authors of the study.
He believes a much larger area of the Pinnacles most likely suffered similar damage.
"The area we have looked at so far is only the tip of the iceberg," he said.
The researchers believe oil floating over the Pinnacles was sprayed with chemical dispersants, which led to oil sinking and contaminating the reef. The paper also says a tropical storm that passed over the area during summer 2010 churned up the sea and caused oil to reach the corals.
"It is a new region and a new ecosystem showing impact," said Erik Cordes, a deep-sea marine scientist familiar with the Pinnacles Reef study. He's been involved with teams looking at coral damage closer to the site of the BP blowout.
"We'll have to monitor it over time," Cordes said.
Even though more than five years have passed since the spill, scientists are still locked in studies to figure out where the oil went and what effects it had on the Gulf ecosystem.
MacDonald said one way to protect the reef from further damage would be to designate it as a protected marine sanctuary.
© 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.

California Drought-Owens Valley

Water Flows Again In Los Angeles Aqueduct. Water in the Los Angeles aqueduct that helped fuel Los Angeles' growth was flowing toward the city Wednesday for the first time in six months after workers removed an earthen and concrete dam that had diverted runoff to the parched Owens Valley.
With little mountain runoff due to a historic drought, water managers made the unprecedented decision to try to meet legal obligations to keep the Owens River flowing, control dust from a dry lake bed and irrigate pastures where cattle graze instead of sending water to the city.
For those in the Owens Valley, who have a history of conflict with the metropolis hundreds of miles to the south, the plugged-up aqueduct brought relief to some and misery to others.
Cattleman Mark Lacey got a taste of both.
In the southern end of the valley this summer where the Department of Water and Power mostly fulfilled irrigation contracts, Lacey's cattle grazed amid an oasis as cool, clear water poured onto verdant fields framed by barbed wire.
About 100 miles north, where DWP cut off irrigation, the land he leases turned dry and dusty.
Lacey had to lay off some ranch hands and he trucked a third of his cattle to Nebraska and sent another third to greener pastures in Nevada and Oregon.
Like others in California's massive agriculture industry, Owens Valley ranchers are subject to complex water rights and largely dependent on snowmelt from the Sierra Nevada that looms nearby.


[caption id="attachment_2385718" align="alignleft" width="150"]<a href="http://cff1.greenatom.net/uploads/2015/10/28101839/la-aqueduct-dam_1big_ap.jpg"><img class="size-thumbnail wp-image-2385718" src="http://cff1.greenatom.net/uploads/2015/10/28101839/la-aqueduct-dam_1big_ap-150x150.jpg" alt="Crews remove a temporary dam they built in the Los Angeles aqueduct" width="150" height="150" /></a> Crews remove a temporary dam they built in the Los Angeles aqueduct[/caption]
Unlike most farmers, though, they are also at the mercy of Los Angeles, which looms even larger. LA owns most of the water rights it furtively bought in the early 1900s in a widely chronicled land grab loosely recounted in the movie "Chinatown."
William Mulholland conceived the gravity-fed channel to slake the growing city's thirst and famously quipped, "There it is. Take it," as water first flowed into LA 102 years ago.
There was no such declaration Tuesday as workers used an excavator to begin dismantling the temporary dam.
The aqueduct's contribution to Los Angeles has diminished over time, given legal fights over the environment and greater reliance on the California Water Project and the Colorado River.
The 338-mile aqueduct system typically provides about a third of the city's water, it but it can supply a larger share after a wet and snowy winter, which forecasters are predicting in the months ahead because of El Nino.
The aqueduct will only account for about 3 percent of this year's water because of the drought, said aqueduct manager Jim Yannotta. The flow is being restored because irrigation season is over and legal obligations in the Owens Valley have expired for the year.
The relationship between the locals and the "the city," as LA is called in this rural patch of high desert, has been fraught with conflict that intensified this spring when the Department of Water and Power announced that the historic low snow levels would force it to shut off irrigation water.
"There's a little bit of animosity toward DWP that wasn't there a few years ago," Lacey said. "When you get desperate times, it creates heightened tension."
Ranchers had agreed to make concessions, but DWP rejected them.
After some late spring rains, the department reversed course and said it would not send water to LA, but would dam the aqueduct and keep runoff in the Owens Valley.
DWP is required by court settlements to provide water to the Owens River and dampen the desiccated Owens Lake to control unhealthy dust that has blown since its waters were siphoned south.
<a href="http://www.earth.com/news/improved-air-quality-during-lockdowns-saved-tens-of-thousands-of-lives/">Air quality</a> regulators and environmental groups agreed to take less water from DWP for dust control and habitat protection so ranchers in Inyo County could water their pastures. Ranchers in Mono County, however, lost out because there's no legal settlement protecting their water supply.
Nathan Reade, the agriculture commissioner for Inyo and Mono counties, said shutting off the spigot to everyone would have devastated the farming industry in the area. Water Flows Again In Los Angeles Aqueduct
Farm production from the two counties barely registers a blip in the state's overall farm economy, but ranching has long been a way of life in a place that provided a backdrop for westerns starring Roy Rogers, John Wayne and Gary Cooper, and featuring the pluck of the Lone Ranger and Hopalong Cassidy.
Cattle forage on the valley floor in winter and chomp on irrigated pasture in summer. Some ranchers drive their cattle up to federal land in the mountains in summer, which is how Scott Kemp managed to keep much of his herd nourished despite water cutbacks.
The state's drought had already forced farmers to cut herd sizes. Reade estimated livestock has been reduced 40 percent to 50 percent in recent years.
Unlike row and tree crops, livestock is mobile.
Gary Giacomini, who lost most of his grazing land this summer when the Department of Water and Power cut off irrigation in Mono County, paid another rancher to let his cattle graze.
Even after reducing herd sizes significantly, ranchers have been helped by high beef prices.
Giacomini said the predicament reminded him of one of his father-in-law's sayings.
"His dad told him, 'God never intended us to have a good market and good feed at the same time,'" he said. "I guess that premise has held through the generations."
© 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.

Water Flows Again In Los Angeles Aqueduct

Water Flows Again In Los Angeles Aqueduct. Water in the...

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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?

[sendtonews key="X0f6OHYoI4-2310561-12187" 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 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



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Santiago, Chile in South America

[sendtonews key="JRaP49ISmm-2357509-12187" type="single"] Today’s Video of the Day from the...

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



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.

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



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 city of Dublin on Ireland's east coast

[sendtonews key="qjvhBOBnY8-2426650-12187" 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 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

[sendtonews key="oL4FnPTGCV-2384527-12187" 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.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

[sendtonews key="f8fukm28Vz-2491833-12187" type="single"] Today's Video of the Day from NASA...

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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

[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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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

[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



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

[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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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

[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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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.

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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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...