The warming climate threatens to thaw permafrost, which will result in the release of carbon dioxide and methane into the atmosphere creating feedbacks to climate change — more warming and greater permafrost thaw. (sciencedaily.com)
Burning fossil fuels and other economic activities release greenhouse gases such as carbon dioxide and methane into the atmosphere, and warm the ocean and atmosphere. (nsidc.org)
If permafrost soils thaw under climate warming they will release carbon dioxide and methane to the atmosphere. (dotearth.blogs.nytimes.com)