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Who decides how to save the earth?
This Dec. 1968 image taken during the Apollo VIII mission and released by NASA shows the planet Earth. If Earth overheats, can it be artificially cooled? Should the effort begin now? Who would decide? The very idea of "geoengineering," and the unknown risks of tweaking our climate, left many participants in a March 2011 conference of international experts in Chicheley, England uneasy. (AP Photo/Courtesy of Earth Sciences and Image Analysis Laboratory, NASA Johnson Space Center)