How much carbon is released into the atmosphere by thawing permafrost?
One of the most worrisome unknowns about climate change is the behavior of positive feedbacks that amplify warming.
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#1 Sep 17, 2012
Worrisome for sure as the shrinking ice and snow cover in the Arctic - white and reflective - are being replaced by dark land and water that absorb more solar radiation. Thus a positive feedback on its own could trigger another one, namely, the thawing of massive store of carbon in Arctic permafrost soils.
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