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PostPosted: Mon Dec 05, 2011 8:54 am 
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http://www.scientificamerican.com/artic ... of-climate

Three-Quarters of Climate Change Is Man-Made
An independent study quantifies the human and natural contributions, with solar radiation contributing only minimally

Natural climate variability is extremely unlikely to have contributed more than about one-quarter of the temperature rise observed in the past 60 years, reports a pair of Swiss climate modelers in a paper published online December 4. Most of the observed warming—at least 74 percent—is almost certainly due to human activity, they write in Nature Geoscience.

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