A new research has found that prehistoric global cooling that started in Antarctica about 35.5 million years ago, was caused by a sharp drop in the carbon dioxide (CO2) levels.
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.
"Our studies show that just over thirty-five million years ago, 'poof,' there was an ice sheet where there had been subtropical temperatures before," said Matthew Huber, assistant professor of earth and atmospheric sciences at Purdue University.
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