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May 11 2013

Ice Cores Reveal Green Arctic

Analyses of sediment cores show that Arctic summers 3.6 million years ago were a good 8 degrees C warmer than they are today, and supported Douglas Fir and hemlock.

The Arctic wasn't always covered in ice. Samples of sediment layers beneath a frozen lake show this region used to be a lot warmer—and may thaw out again in the future. The work is in the journal Science.

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