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Posted Thu Feb 17 2011: from NSIDC, via IPS:
Permafrost Melt Soon Irreversible Without Major Fossil Fuel Cuts http://apocadocs.com/s.pl?1297985448
Thawing permafrost is threatening to overwhelm attempts to keep the planet from getting too hot for human survival. Without major reductions in the use of fossil fuels, as much as two-thirds of the world's gigantic storehouse of frozen carbon could be released, a new study reported. That would push global temperatures several degrees higher, making large parts of the planet uninhabitable. Once the Arctic gets warm enough, the carbon and methane emissions from thawing permafrost will kick-start a feedback that will amplify the current warming rate, says Kevin Schaefer, a scientist at the National Snow and Ice Data Center (NSIDC) in Boulder, Colorado. That will likely be irreversible. And we're less than 20 years from this tipping point. Schaefer prefers to use the term "starting point" for when the 13 million square kilometres of permafrost in Alaska, Canada, Siberia and parts of Europe becomes a major new source of carbon emissions. "Our model projects a starting point 15 to 20 years from now," Schaefer told IPS. The model used a 'middle of the road' scenario with less fossil fuel use than at present. Even at that rate, it found that between 29 and 60 percent of the world's permafrost will thaw, releasing an extra 190 gigatonnes of carbon by 2200. The study is the first to quantify when and how much carbon will be released and was published this week in the meteorological journal Tellus.
[Read more stories about: holyshit, permafrost meltdown, death spiral, arctic meltdown, feedback loop, tipping point]

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'Doc Michael says:
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