Marine geologic records show that before 34 million years ago Earth was in a balmy greenhouse state. There were no icesheets or glaciers on any continents. Then, there was a sudden cooling.
“Geologically speaking, it happened pretty fast. Antarctica hadn’t been glacial before that for a very long time,” said David Naafs, an organic geochemist at the University of Bristol’s Organic Geochemistry Unit and co-author of the paper.
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