Researchers at Sheffield University, working with other universities, have studied sudden climate warmings  that occurred around 55 million years ago and concluded that they were triggered by the release of carbon that had been stored in Polar region permafrosts.

This research suggests that a similar risk exists today, since rises in the earth’s average temperature could cause Polar permafrosts to thaw and release the carbon that is currently stored in them as decayed, frozen vegetation.
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