Carbon feedback

“…as thawing permafrost dumps more of its massive supply of greenhouse gases into the air—warming the climate and melting even more carbon- and methane-emitting permafrost—an unstoppable feedback loop may be triggered, one that could ultimately turn the Arctic from a carbon sink that absorbs emissions to a carbon source.” ~ https://www.nrdc.org/stories/permafrost-everything-you-need-know