Arctic climate switched from greenhouse to icehouse, cores show
Last Updated Thu, 01 Jun 2006 09:35:44 EDTCBC News
A 400-metre-long core of sediment recovered near the North Pole shows the region was subtropical about 55 million years ago.
Scientists consider the Arctic to be a bellwether for climate change, but until recently, they've had to rely on samples collected thousands of kilometres away from the Pole.
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