Permafrost timebomb

Climate Central: For tens of thousands of years, huge amounts of plant matter--roots, leaf fragments and the like--have been kept in cold storage underground in the northern parts of Alaska, Canada, Europe and Siberia. They're embedded in permafrost, or permanently frozen soil. Even when the top few inches of ground thaw out in the Arctic summer, permafrost never does. As the planet continues to warm, however, the "perma" in permafrost is looking less eternal. Scientist have known for years, in fact, that rising......

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