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

InsideClimate News
By Katherine BagleyNov 11, 2015, 11:00 am72 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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