Expiring

“For the first time since records began, the parts per million (ppm) of CO2 in the atmosphere were over 400 globally. … The last time the Earth had this much carbon dioxide in the atmosphere was more than a million years ago, when modern humans hadn’t even evolved yet.” (http://www.theguardian.com/environment/2015/may/06/global-carbon-dioxide-levels-break-400ppm-milestone)

It’s not clear that modern humans have evolved even now.

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