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Yale e360
May 14, 2019, 1:18 pm167 ptsThe concentration of carbon dioxide in the atmosphere hit 415.39 parts per million (ppm) over the weekend — the highest level seen in some 3 million years, before humans existed, according to scientists at the Mauna Loa Observatory in Hawaii. CO2 levels are now rising 3 ppm each year, up from an average 2.5…
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