We just hit 400 ppm CO2 in the atmosphere, for a whole month

Grist
By Amelia UrryMay 6, 2015, 2:37 pm124 pts
I have good news, and I have bad news. First, the bad news: The atmosphere just passed another doom threshold — there are now more than 400 parts per million of CO2 up there. Actually, we’ve crossed this line before, but that was just for a few hours or days at a handful of observing sites. This time…

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