Permafrost lands across Siberia and Alaska that contain vast stores of carbon are beginning to thaw, bringing with it the threat of a big increase in global warming by 2100, a U.N. report said on Tuesday.
http://www.huffingtonpost.com/2012/11/27/global-warming-permafrost-thaw-siberia_n_2196876.html?1354025112&ncid=edlinkusaolp00000009#slide=1147357
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