If that much near-surface permafrost thaws, it could release considerable amounts of greenhouse gases into the atmosphere, and that could amplify global warming. We could be underestimating the rate of global temperature increase.  -   David Lawrence     Quotes
If that much near-surface permafrost thaws, it could release considerable amounts of greenhouse gases into the atmosphere, and that could amplify global warming. We could be underestimating the rate of global temperature increase. David Lawrence