Last time there was this much CO2 in the atmosphere was 3 million years ago, in the Pliocene era. What can that tell us about what we're in for? The world will probably keep warming. Sea levels will probably keep rising. Ice sheets will probably keep melting. Saber-tooth tigers? NOT OUT OF THE QUESTION. Okay, probably out of the question.
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Jess Zimmerman is the editor of Grist List.
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