The National Geographic news has written about another San Francisco first:
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.
The new by-law enacted in January 2016 will mean that 15 to 30 per cent of roof space on new office construction projects must incorporate solar, green roofs, or both. An earlier by-law requires new residential and commercial buildings under ten storeys to install solar panels or a solar heating system with fifteen per cent roof coverage.
View original post 282 more words