This week, San Francisco became the first U.S. city to require that certain new buildings be built with a green roof—an eco-friendly design technique that sows plants above a roofline. This latest action builds on a growing trend that has taken root around the world, and which boosters say offers significant benefits for the planet. http://news.nationalgeographic.com/2016/10/san-francisco-green-roof-law/
Article courtesy of National Geographic by Jackie Snow
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