NicoPermafrost is ground that is permanently frozen. It often contains large amounts of frozen, partially decayed plant matter. When permafrost melts, this plant matter can finish decaying, releasing built up methane in the process. The melting of permafrost is one of the major climate tipping points.
Permafrost
Permafrost is ground that is permanently frozen. When permafrost melts, it emits large amounts of methane.