Earth's CO2 Level Passes 400 ppm - highest since the Pliocene
Posted by cypresstx on 5/12/2013, 12:44 pm
http://news.nationalgeographic.com/news/energy/2013/05/130510-earth-co2-milestone-400-ppm/

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Earth's CO2 Level Passes 400 ppm - highest since the Pliocene - cypresstx, 5/12/2013, 12:44 pm
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