Could we be wrong about global warming? - Science Fair - USATODAY.com:
"The conclusion, Dickens said, is that something other than carbon dioxide caused much of this ancient warming. 'Some feedback loop or other processes that aren't accounted for in these models -- the same ones used by the Intergovernmental Panel on Climate Change for current best estimates of 21st century warming -- caused a substantial portion of the warming that occurred during the PETM.'"
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