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NSF issues world a wake-up call: "Release of even a fraction of the methane stored in the shelf could trigger abrupt climate warming.”

Intro from webpage:
Methane release from the not-so-perma-frost is the most dangerous amplifying feedback in the entire carbon cycle. Research published in Friday’s journal Science finds a key “lid” on “the large sub-sea permafrost carbon reservoir” near Eastern Siberia “is clearly perforated, and sedimentary CH4 [methane] is escaping to the atmosphere.”