Read here. During the world's "warmest" decade ending 2009, Alaska's tundra areas have experienced warming and thawing. Per the IPCC climate scientists' predictions, the Alaskan thawing tundra areas should be producing higher amounts of methane gas, at an accelerated rate.
As is most often the case, scientists who predict catastrophe are most often the ones who are spectacularly wrong. The predicted accelerating increase of the feared methane gas, from warming Alaskan tundra, has spectacularly been wrong, as the latest decade evidence reveals. Source of below graph here.