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The "Sleeping Giant" in Arctic Permafrost [HD] .

Science@NASA: 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.

Release Date: 21 June 2013

Website: http://science.nasa.gov/

Credit: NASA Science

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