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As CO2 Passes 400 PPM, What Goes Up Might Not Come Down

  • InsideClimate News faviconInsideClimate News

    By Katherine BagleyNov 11, 2015, 11:00 am80 pts
    Reaching the symbolic 400 ppm threshold underscores governments' inaction and worsening global warming impacts. By Katherine Bagley Carbon dioxide concentrations in the atmosphere once again exceeded 400 parts per million Monday, but this time they may never fall back down, according to scientists.
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