据哥伦比亚大学的研究者斯图亚特·加芬说，像上面这张图片中的绿色屋顶所带来的“荫凉”远不仅仅被这个屋顶底下的一所房子所“享用”了，她说：“这些绿色屋顶对众多受到荫蔽的房子来说是一种‘双赢’。”

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.

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