How Cold Was the Last Ice Age? The Answer May Surprise You

We know glaciers covered the northern hemisphere during the Last Glacial Maximum, but how different are temperatures today and what did greenhouse gases have to do with it?

Ruth Schuster
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Crevasses form on top of a glacier in Greenland, June 2018.
CRACKING UP: Crevasses form on top of a glacier in Greenland, June 2018.Credit: Lucas Jackson/REUTERS

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