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Geoengineering: 'A Bad Idea Whose Time Has Come'

Driving a Prius and putting up solar panels aren't the only options for cooling the earth's climate. More radical ideas include brightening clouds, creating giant algae blooms in the ocean and launching spacecraft to deploy giant sunshades. It might sound a bit far-fetched, but scientists are considering ideas like these -- known as geoengineering -- to alter the climate.