400 ppm CO2? Add Other GHGs, and It’s Equivalent to 478 ppm

By Genevieve Wanucha   June 6th,2016
The Keeling Curve record from the NOAA-operated Mauna Loa Observatory shows that the atmospheric carbon dioxide concentration hovers around 400 ppm, a level not seen in more than 3 million years when sea levels were as much as 80 feet higher than today.

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