Not-So-Permafrost: Big Thaw of Arctic Soil May Unleash Runaway Warming

"Drunken" trees listing wildly, cracked highways and sinkholes--all are visible signs of thawing Arctic permafrost. When this frozen soil warms, it releases carbon dioxide, methane and other greenhouse gases as microbes start to thrive on the organic material it contains--a potentially potent source of uncontrollable climate change. [More]

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