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ScienceCasts: The "Sleeping Giant" in Arctic Permafrost

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Published on Jun 21, 2013

Visit http://science.nasa.gov/ for breaking science news.

Arctic permafrost soils contain more accumulated carbon than all the human fossil-fuel emissions since 1850 combined. Warming Arctic permafrost, poised to release its own gases into the atmosphere, could be the "sleeping giant" of climate change.

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