Miles beneath the Arctic permafrost, a hole is emitting carbon to the ocean, and the seafloor is quietly swallowing most of it

Arctic permafrost holds roughly 1,300 gigatonnes of ancient organic carbon — the compressed remains of plants frozen for millennia. As temperatures rise and coastlines crumble into warming seas, that carbon is increasingly on the move, flushing into the Arctic Ocean at a rate that could climb by more than 150 percent before the century ends. ... Read more