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Posted Sat Feb 28 2009: from Purdue University, via EurekAlert:
Prehistoric global cooling caused by CO2, research finds
Ice in Antarctica suddenly appeared-- in geologic terms-- about 35 million years ago. For the previous 100 million years the continent had been essentially ice-free. The question for science has been, why? What triggered glaciers to form at the South Pole? ... Additional computer modeling of the cooling suggests that the cooling was caused by a reduction of greenhouse gases in the atmosphere. Even after the continent of Antarctica had drifted to near its present location, its climate was subtropical. Then, 35.5 million years ago, ice formed on Antarctica in about 100,000 years, which is an "overnight" shift in geological terms.
[Read more stories about: carbon emissions, climate impacts]

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Vivian says: "100,000 years is "overnight"? What about the last 1000!?"
George says: "@vivian -- I think that's just a wink."

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'Doc Michael says:
Maybe some long-vanished civilization decided to stop using Frelxamitite and Wanklerifs for transportation and energy -- because they were screwing up the atmosphere.

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