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Grist
Sep 27, 2016, 7:08 pm106 ptsIt’s the year we finally crossed a threshold we won’t be able to un-cross in a hurry: The concentration of CO2 in the atmosphere exceeded 400 parts per million and stayed there. We may not see it drop below that level again before we, too, go the way of Bowie. September is the month when the concentration…
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