Warming spike: Stalagmites show permafrost peril

Posted by Washington Post: Juliet Eilperin on June 20th, 2013
Agence France-Presse: Areas of permafrost could start to thaw within decades, freeing long-stored greenhouse gases to the atmosphere, according to a study released on Wednesday that measured ancient stalagmites in a Siberian cave. Continuous permafrost -- land that is frozen all year round -- starts to thaw when temperatures rise around 1.5 degrees Celsius (2.7 degrees Fahrenheit) above pre-industrial levels, its authors said. Earth has already warmed by around 0.8 C (1.4 F) since the start of the Industrial Revolution......

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