MIT: Warming gas levels hit 'troubling milestone' - Thursday, May 31, 2012
It’s been at least 800,000 years — probably more — since Earth saw carbon dioxide levels in the 400s (parts per million), Butler and other climate scientists said.
Until now.
But political dynamics in the United States mean there’s no possibility of significant restrictions on man-made greenhouse gases no matter what the levels are in the air, said Jerry Taylor, a senior fellow of the libertarian Cato Institute.
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