Global carbon dioxide concentrations have reached a new monthly record of 400 parts per million.

The milestone was announced last week by the US National Oceanic and Atmospheric Administration, who say that March 2015 was the first month that the entire globe broke 400ppm, reaching levels that haven’t been seen for about two million years.

Carbon dioxide passed the 400ppm level for the first time in the Arctic in 2012, and then at Mauna Loa, Hawaii, in 2013.

Further details here.

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