Happy talk about the climate

Mathiole[Update for climate change denialists: please save me the trouble of marking your comments as spam. This blog is not for the willfully ignorant or the scientifically illiterate, so a hearty good-bye to you all.]

The non-binding climate deal which the US and China just signed will allow the Earth's atmospheric carbon dioxide concentration to go to 500ppm and beyond by the end of the century, far past the current concentration of 400ppm. Historically, this concentration was sufficient to produce an ice-free Arctic, significantly higher ocean levels, and an environment unlikely to be able to sustain large human populations.
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