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Scientists predict that by the end of the century, U.S. urban and suburban areas will have expanded by an area about the size of South Dakota. That's an awful lot of blacktop, adding to scientists' worries that the growth of cities could increase global warming, in part because of the way a city absorbs heat. But a new study has found that cool roofs, those painted with reflective materials, and green roofs (those with plants on them) could counteract this warming.
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