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Science  26 Feb 2010:
Vol. 327, Issue 5969, pp. 1070-1071
DOI: 10.1126/science.327.5969.1070-b

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Preliminary findings presented at the annual meeting of the American Association for the Advancement of Science (the publisher of Science) suggest that some proposed techniques to cool the planet manually may have fewer barriers than previously thought. But many technical and societal barriers remain, and the environmental effects of planet-hacking techniques remain uncertain.