22 Feb 2013:
A 1.5 C Temperature Rise Could
Release Greenhouse Gases in Permafrost
A global temperature increase of 1.5 degrees Celsius could unleash more than 1,000 gigatons of carbon and methane
currently trapped beneath Siberian permafrost and accelerate global climate change, a new study says. In a study conducted in a frozen cave in Siberia, researchers analyzed stalactites and
stalagmites which, since they form only when rainwater and snowmelt drip into the caves, provide a glimpse into 500,000 years of changing permafrost conditions. According to their findings, records of an especially warm period 400,000 years ago suggest that a 1.5-degree increase compared to current temperatures would trigger the thawing of permafrost far north of its existing southern boundary. And since permafrost covers 24 percent of the exposed land surface in the Northern Hemisphere, significant thawing could release huge amounts of methane and carbon dioxide, said Anton Vaks, a scientist at Oxford University and lead researcher on the study, published in Science Express
. In addition to the effects the loss of permafrost could have on climate, it could also have major regional implications, affecting roadways, railroads, and natural gas facilities built atop the frozen landscape. A 2012 study estimated that permafrost regions cover about 22 million square kilometers worldwide
, including vast regions of Siberia, Central Asia, and the Himalayas.
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A look at how acidifying oceans could threaten the Dungeness crab, one of the most valuable fisheries on the U.S. West Coast. 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.
An indigenous tribe’s deadly fight to save its ancestral land in the Amazon rainforest from logging. 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.
Residents of the Chocó Rainforest in Ecuador are choosing to plant cacao over logging in an effort to slow deforestation.
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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.