From the New York Times. Shenzhen needs green roofs to help lessen the load on sewers during heavy rains and cleanse the air.

The Toronto council this month got a look at a proposed green roof by-law that would make such installations mandatory on certain new developments with a gross floor area exceeding 54,000 square feet. The measure, which is a component of Mayor David Miller’s environmental strategy, proposes greening 30 to 60 percent of the roof area, depending on building size. Exemptions include schools, industrial structures, low- to mid-rise apartment buildings and affordable housing.” “If adopted, the city of Toronto would be the first municipality in North America with a mandatory green roof by-law. Similar requirements exist in Japan, Switzerland, Germany and France.

Advertisements