Siberian Caves Reveal Advancing Permafrost Thaw

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Permafrost is not so permanent. Across the Arctic, swathes of once-frozen-solid ground have begun to thaw . If the records preserved in Siberian caves are accurate, much more of the region could melt if temperatures continue to warm. [More] (http://www.scientificamerican.com/article.cfm?id=siberian-caves-reveal-permafrost-thaw)

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