Permafrost: The Tipping Time Bomb

From Peter Sinclair:

One of the most feared of climate change "feedbacks" is the potential release of greenhouse gases by melting arctic permafrost soils. New research indicates a critical threshold of that feedback effect could be closer than we once thought.

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The reality of all of that previously tied up carbon freed into the atmosphere scares the crap out of me. It should scare them too.