Carbon Dioxide Levels in Atmosphere Cross 400 PPM Milestone

InsideClimate News
By InsideClimateMay 10, 2013, 2:00 am7 pts
(Guardian) For the first time in human history, the concentration of climate-warming carbon dioxide in the atmosphere has passed the milestone level of 400 parts per million (ppm). The last time so much greenhouse gas was in the air was several million years ago, when the Arctic was ice-free, savannah spread…

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