What's the greenest roof? A white one. White-painted roofs are three times more efficient than "green roofs"ârooftops that are planted over with grass or other greeneryâat countering global warming, a new analysis found. White and green are both are much better for the environment than traditional black-colored roofs, which heat up under the sun, drive up air conditioning bills, and make cities and towns a few degrees warmer than they would be otherwise. Cooler roofs can make a big difference: In a previous study, the same team determined that a 100-square-meter white roof offsets 10…
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