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May 10, 2013 05:36 pm PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/wEtRJu-xe4U/story01.htm
400 ppm carbon dioxide? In myatmosphere?
It's true, at least for today. Although the real concern in climate science is average concentrations of carbon dioxide over much longer periods of time, surpassing the 400 ppm mark, even for a day, is a historic milestone. 400 ppm was once a level we talked about avoiding altogether through mitigation of greenhouse gas emissions. [...]Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/wEtRJu-xe4U/story01.htm
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