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I think same amount of effort will be put into controling it as is put into reducing global warming !.
wait.. if we keep sending stuff up there soon it'll be dense enough to block out the sun
At the NASA Institute for Advanced Concepts (NIAC) meeting last fall, Roger Angel, an astronomer and optics expert at the University of Arizona, produced a highly detailed – and highly futuristic -- proposal for a sunshade huge enough to cut incoming sunlight by 1.8 percent. That, he says, should counteract the warming expected from a doubling of atmospheric carbon dioxide... Angel suggests that the shield, covering an area of 4.7 million square kilometers (slightly smaller than the area of the continental United States west of the Mississippi River), would be best made as a cloud of 16 trillion free-flying circular refractors, each 0.6 meter (2 feet) in diameter. . Each refractor would be about 5 microns thick and weigh 1.2 grams. The refractors would be launched in stacks and then deployed upon reaching the target zone.