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9 not-so-crazy ideas to combat climate change

By: Bryan Nelson on March 8, 2010, 11:01 a.m.
Giant orbital sun shield

Photo: UA Steward Observatory

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Giant orbital sun shield

Several scientists have proposed shooting huge mirrors into space to reflect the sun's rays. The mirrors could be as large as the size of Greenland and would act as a shield, blocking out about 2 percent of the sun's light. As to how to get the giant shades into space, that's for NASA to figure out.