12 Jun 2012:
Heating of Forests Releases
Large Amounts of CO2 from Soil, Study Says
An experiment that heated forests in the eastern U.S. by 10 to 20 degrees F led to an increase in the release of carbon dioxide from soils by up to eight times
, according to a new study. When researchers from the University of California, Irvine and other institutions subjected experimental forest plots in Wisconsin and North Carolina to extreme warming, they found that woodland soils released unexpectedly large quantities of CO2, a finding that could have major implications as the world continues to warm. Soil, which takes its rich brown color from large amounts of decaying carbon in leaves and roots, stores twice as much CO2 as the atmosphere, and major releases of CO2 from soils could cause temperatures to rise significantly, the researchers said. “This suggests that soils could accelerate global warming through a vicious cycle in which human-made warming releases carbon from soils to the atmosphere, which, in turn, would warm the planet more,” said lead researcher Francesca Hopkins.
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.
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An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
Ugandan scientists monitor the impact of climate change on one of Africa’s most diverse forests and its extraordinary wildlife. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.