While I agree it is difficult to say with certainty how much man-made global warming will have, and indeed whether (in the short term anyway) it will have a deleterious effect on our civilization, the things that do concern me are that A) the effects are very hard to reverse, once begun and B) the results will not be temporary, but something we would have to live with for, literally, hundreds if not thousands of years.
Those reasons are, I think, enough to warrant taking the foot off the gas pedal of global warming - and it appears the rest of the civilized world agrees, outside the US.
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Si vis pacem parabellum.
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