A key polar bear population fell nearly by half in the past decade, a new U.S.-Canada study found, with scientists seeing a dramatic increase in young cubs starving and dying. Researchers chiefly blame shrinking sea ice from global warming. Scientists from the U.S. Geological Survey and Environment Canada captured, tagged and released polar bears in the southern Beaufort Sea from 2001 to 2010.
Plants all over the world are more sensitive to drought than many experts realized, according to a new study by scientists at the Univ. of California, Los Angeles and China’s Xishuangbanna Tropical Botanical Garden. The research will improve predictions of which plant species will survive the increasingly intense droughts associated with global climate change.
Today’s climate models predict a 50% increase in lightning strikes across the U.S. during this century as a result of warming temperatures associated with climate change. Reporting in Science, a team of climate scientists look at predictions of precipitation and cloud buoyancy in 11 different climate models and conclude that their combined effect will generate more frequent electrical discharges to the ground.
Not long ago, it would have taken several years to run a high-resolution simulation on a global climate model. But using some of the most powerful supercomputers now available, Lawrence Berkeley National Laboratory climate scientist Michael Wehner was able to complete a run in just three months. Not only were the simulations much closer to actual observations, but the high-resolution models were far better at reproducing intense storms.
The rapidly melting ice sheets on the coast of West Antarctica are a potential major contributor to rising ocean levels worldwide. Although warm water near the coast is thought to be the main factor causing the ice to melt, the process by which this water ends up near the cold continent is not well understood. Using robotic ocean gliders, Caltech researchers now have a better understanding of the cause.
Global warming is likely playing a bigger role than previously thought in dead zones in oceans, lakes and rivers around the world and it's only going to get worse, according to a new study. Dead zones occur when fertilizer runoff clogs waterways with nutrients, such as nitrogen and phosphorous. That leads to an explosion of microbes that consumes oxygen and leaves the water depleted of oxygen, harming marine life.
In classrooms and everyday conversation, explanations of global warming hinge on the greenhouse gas effect. In short, climate depends on the balance between two different kinds of radiation: The Earth absorbs incoming visible light from the sun, called “shortwave radiation,” and emits infrared light, or “longwave radiation,” into space.
Scientists believe that until about 2.4 billion years ago there was little oxygen in the atmosphere. Evidence in support of this hypothesis comes from studies of sulfur isotopes preserved in the rock record. But the sulfur isotope story has been uncertain because of the lack of key information that has now been provided by a new analytical technique developed by a team of Caltech geologists and geochemists.
Scientists have identified a mechanism that could be a big contributor to warming in the Arctic region and melting sea ice. The research was led by scientists from Lawrence Berkeley National Laboratory. They studied a long-wavelength region of the electromagnetic spectrum called far infrared. It’s invisible to our eyes but accounts for about half the energy emitted by the Earth’s surface. This process balances out incoming solar energy.
Wisconsin is famous for its ice fishers. Less well known are the state’s big-league ice drillers. Hollow coring drills designed and managed by the Univ. of Wisconsin-Madison have been instrumental to new research published this week documenting carbon dioxide in the atmosphere between 23,000 and 9,000 years ago, based on data from an 11,000-foot hole in Antarctica.
In spite of the broad scientific consensus about its existence, global warming remains a contentious public policy issue. Yet it’s also an issue that requires a public consensus to support policies that might curb or counteract it. According to research, the task of educating the public about climate change might be made easier or more difficult depending on their perception of short-term versus long-term temperature changes.
A new analysis of global energy use, economics and the climate shows that without new climate policies, expanding the current bounty of inexpensive natural gas alone would not slow the growth of global greenhouse gas emissions worldwide over the long term, according to a study. Because natural gas emits half the carbon dioxide of coal, many people hoped the recent natural gas boom could help slow climate change.
Scientists at the U.S. Department of Energy’s Argonne National Laboratory have created a new model to more accurately describe the greenhouse gases likely to be released from Arctic peatlands as they warm. Their findings, based on modeling how oxygen filters through soil, suggest that previous models probably underestimated methane emissions and overrepresented carbon dioxide emissions from these regions.
Using satellite observations and a large suite of climate models, Lawrence Livermore National Laboratory scientists have found that long-term ocean warming in the upper 700 m of Southern Hemisphere oceans has likely been underestimated.
The atmospheric conditions associated with the unprecedented drought currently afflicting California are "very likely" linked to human-caused climate change, according to Stanford Univ. scientists. The team used a combination of computer simulations and statistical techniques to show that a persistent region of high atmospheric pressure hovering over the Pacific Ocean was likely to form from modern greenhouse gas concentrations.
Researchers may soon have a better idea of how tiny particles of pollution are formed in the atmosphere. These particles, called aerosols, are hazardous to human health and contribute to climate change, but researchers know little about how their properties are shaped by chemical reactions in the atmosphere. Unraveling this chemistry could someday lead to more effective policies to protect human health and the Earth’s climate.
As more gardeners and farmers add ground charcoal, or biochar, to soil to both boost crop yields and counter global climate change, a new study by researchers at Rice Univ. and Colorado College could help settle the debate about one of biochar’s biggest benefits: the seemingly contradictory ability to make clay soils drain faster and sandy soils drain slower.
Spurred chiefly by China, the United States and India, the world spewed far more carbon pollution into the air last year than ever before. The world pumped an estimated 39.8 billion tons of carbon dioxide into the air last year by burning coal, oil and gas. That is 778 million tons or 2.3% more than the previous year. World leaders gather this week to discuss how to reduce heat-trapping gases.
Conditions on Earth for the first 500 million years after it formed may have been surprisingly similar to the present day, complete with oceans, continents and active crustal plates. This alternate view of Earth’s first geologic eon, called the Hadean, has gained substantial new support from the first detailed comparison of zircon crystals that formed more than 4 billion years ago with those formed contemporaneously in Iceland.
The production and consumption of chemical substances threatening the ozone layer has been regulated since 1987 in the Montreal Protocol. Eight international expert reports have since been published, the most recent of which was presented on Sept. 10 at the United Nations Headquarters in New York. Model calculations reveal that by 2050 the ozone layer may return to its 1980 levels.
Remember the polar vortex, the huge mass of Arctic air that can plunge much of the U.S. into the deep freeze? You might have to get used to it. A new study says that as the world gets warmer, parts of North America, Europe and Asia could see more frequent and stronger visits of that cold air. Researchers say that's because of shrinking ice in the seas off Russia.
If ever there were a silver lining to global warming, it might be the prospect of milder winters. After all, it stands to reason that a warmer climate would generate less snow. But a new Massachusetts Institute of Technology study suggests that you shouldn’t put your shovels away just yet.
The tectonic plate that dominates the Pacific “Ring of Fire” is not as rigid as many scientists assume, according to researchers at Rice Univ. and the Univ. of Nevada. The researchers have determined that cooling of the lithosphere makes some sections of the Pacific plate contract horizontally at faster rates than others and cause the plate to deform.
According to Univ. of California Irvine and Princeton Univ. scientists, existing power plants around the world will pump out more than 300 billion tons of carbon dioxide over their expected lifetimes, significantly adding to atmospheric levels of the climate-warming gas. The findings are the first to quantify how quickly these "committed" emissions are growing.
Global warming is here, human-caused and probably already dangerous—and it's increasingly likely that the heating trend could be irreversible, a draft of a new international science report says. The United Nations' Intergovernmental Panel on Climate Change on Monday sent governments a final draft of its synthesis report, which combines three earlier, gigantic documents by the Nobel Prize-winning group.