Siberian permafrost leaking methane

Methane is a greenhouse gas thirty times more potent than carbon dioxide.  Climate change is warming the arctic region and destabilizing the subsea Siberian permafrost that has held back massive methane deposits.

"The amount of methane currently coming out of the East Siberian Arctic Shelf is comparable to the amount coming out of the entire world’s oceans. Subsea permafrost is losing its ability to be an impermeable cap."
See the Mother Jones post.