CO2 levels hit monthly average not seen for 2 million years

Mongabay
By Jeremy HanceMay 7, 2015, 4:44 pm51 pts
For the first time in human history, carbon dioxide concentrations averaged out at 400 parts per million (ppm) worldwide in March, according to NOAA. Carbon dioxide concentrations have likely not hit such levels in two million years—long before Homo sapiens evolved.

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