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CO2 emissions. Levels of the damaging greenhouse gas carbon dioxide have reached an alarming new milestone at the world’s oldest measuring station in Hawaii. It is estimated the last time CO2 concentrations were this high was during the mid Pliocene epoch 2.5-5 million years ago.
(Photo by Ian Britton) Photo used under CC BY
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First published in the May 14, 2019, 7:32 p.m. edition

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