Imagine looking down on a major cityscape and seeing a sea of lush greens dotted with vibrant blues, yellows and Mother Nature’s other favorite hues. Normally, that type of scenery can only be found in the Midwest, over expansive prairies or western plains. However, in the future, metropolises could become “Emerald Cities,” distinguished by the green roofs crowning their skyscrapers and buildings.
http://voices.nationalgeographic.com/2015/09/10/its-easy-being-green-new-research-supports-green-roof-advancement-in-the-u-s/
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