12 May '13, 11pm

Atmospheric CO2 Hits 400 Parts Per Million Mark..

MAUNA LOA OBSERVATORY, Hawaii , May 11, 2013 (ENS) – For the first time in human history, concentrations of the greenhouse gas carbon dioxide, CO2, have risen above 400 parts per million, ppm. Many climate scientists warn that 350 ppm is the safe upper limit for CO2 in the atmosphere. On May 9, the daily mean concentration of carbon dioxide in the atmosphere of Mauna Loa, one of the volcanoes on the Big Island of Hawaii, surpassed 400 parts per million for the first time since measurements began in 1958, when CO2 concentrations averaged 318 ppm. NOAA’s Mauna Loa Observatory on the Big Island of Hawaii (Photo courtesy NOAA) Independent measurements made by both the National Oceanic and Atmospheric Administration, NOAA, and the Scripps Institution of Oceanography have been approaching this level during the past week. Having two programs independently measure the greenhouse g...

Full article: http://ens-newswire.com/2013/05/11/atmospheric-co2-hits-4...

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