Methane Releases From Arctic Shelf May Be Much Larger and Faster Than Anticipated Thawing by climate change of subsea layer of permafrost may release stores of underlying, seabed methane Methane is leaking from the East Siberian Arctic Shelf into the atmosphere at an alarming rate. Credit and Larger Version March 4, 2010 A section of the Arctic Ocean seafloor that holds vast stores of froz…