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Posted Mon Aug 25 2008: from 
AFP: 
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Global warming time bomb trapped in Arctic soil: study http://apocadocs.com/s.pl?1219685068 
Climate change could release unexpectedly huge stores of carbon dioxide from Arctic soils, which would in turn fuel a vicious circle of global warming, a new study warned Sunday.
The study, published in the British journal Nature Geoscience, found that the stock of organic carbon "is considerably higher than previously thought" -- 60 percent more than the previously estimated.
This is roughly equivalent to one sixth of the entire carbon content in the atmosphere. And that is just for North America. 
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[Read more stories about: 
permafrost meltdown, carbon emissions, faster than expected, feedback loop] 
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