Arctic permafrost soils contain more accumulated carbon than all the human fossil-fuel emissions since 1850 combined. Warming permafrost, poised to release its own gases into the atmosphere, could be the "sleeping giant" of climate change.
VIDEO: http://www.youtube.com/watch?v=hZSM8GcmJKg
FULL STORY: http://science.nasa.gov/science-news/science-at-nasa/2013/24jun_permafrost/
