CLIMATE CHANGEThey've said it before, but this time climate scientists are saying it with feeling: The world is warming; it's not all natural, it's us; and if nothing is done, it will get a whole lot worse. ([Read more][1].) [1]: http://www.sciencemag.org/cgi/content/full/315/5813/754
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Richard A. Kerr (2007) studied this question.