Tweaking the climate to save it: Who decides?

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The Sunshade Option
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The Sunshade Option
FILE - This Wednesday, March 16, 2011 picture shows piles of coal at NRG Energy's W.A. Parish Electric Generating Station in Thompsons, Texas. The plant, which operates natural gas and coal-fired units, is one of the largest power plants in the United States. 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/David J. Phillip)