What happens when the permafrost thaws? | BBC Ideas

Around 11% of the Earth's land mass is covered by permafrost. But its delicate balance is being threatened by climate change. Video made in partnership with @bbcideasand ‪@royalsociety. Subscribe here: http://bit.ly/1rbfUog For more news, analysis and features visit: www.bbc.com/news #Permafrost #BBCIdeas #BBCNews