CO2 levels already top 400 ppm, 2 months earlier than last year

March 18, 2014 10:36 PM

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2013 was the first time in human history that carbon dioxide levels had reached over 400 parts per million.

In 2013, carbon dioxide in the Earth's atmosphere topped 400 ppm for the first time but did not cross that marker until mid-May. This puts CO2 levels on the fast track to break another record by summer.

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