UPDATE July 31, 2014. Stories are popping up fast in various media this afternoon about a likely source of a reported, mysterious hole in permafrost in the Yamal region of northern Russia. This hole was spotted by a helicopter pilot in mid-July; reindeer herders reported a second hole some days later. Eric Holthaus of Slate said that there is now:
… new (and definitive) evidence … that the Siberian holes were created via methane released from warming permafrost.