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

Grist
By Andrea ThompsonMay 16, 2016, 8:39 pm89 pts
Just 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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