Tweaking the climate to save it: Who decides?

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The Sunshade Option
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The Sunshade Option
In this March 23, 2011 picture, a small "breakout" group from a low-profile, three-day conference of international experts at a Royal Society retreat in Chicheley, England discusses how the world might oversee research into manipulating the Earth's atmosphere to combat global warming. Like many environmentalists who oppose tampering with the atmosphere, these scientists and other conferees said they would prefer that governments instead agree on reducing greenhouse-gas emissions. (AP Photo/Charles J. Hanley)