Denver Joins S.F., Votes to Require 'Green Roofs' on Big New BuildingsDenver joins San Francisco, New York, Paris, London and other global cities that require or encourage builders to put "green roofs" on large new buildings.
San Francisco Legislation Aims To Add Green Roofs To New BuildingsSan Francisco Supervisor Scott Wiener introduced legislation that would allow developers to substitute a "green roof" for solar panels on new construction.

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