Guardian: Green roofs, like the one pictured above, benefit more than just their owners, according to Stuart Gaffin, a researcher at Columbia University. "They are a win-win on so many fronts," he said. Perhaps the greatest overall benefit of green roofs comes in tackling the "urban heat island" effect, which Gaffin suggests is responsible for two-thirds of New York’s localized warming over the last century. The conventional black rooftops that he calls "tar beaches" are major contributors to …
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