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Is it time to give up on the 350 ppm goal? We’re now consistently above 400.

  • Grist faviconGrist

    By Andrea ThompsonMay 16, 2016, 8:39 pm91 pts
    photo of Is it time to give up on the 350 ppm goal? We’re now consistently above 400. imageJust three years ago this month, the carbon dioxide monitoring station atop Hawaii’s Mauna Loa reached a significant milestone: the first measurement of CO2 concentrations that exceeded the benchmark of 400 parts per million (ppm). Now, they may never again dip below it. As CO2 levels once again approach…
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