Denver votes to require environment-friendly 'green' roofs
Friday, 10 November 2017 DENVER (AP) — Denver became the latest city to require rooftop gardens or solar panels on big new buildings, which backers say will keep the outdoor air cooler, make storm water easier to manage and reduce the amount of energy burned by air conditioners. A ballot initiative mandating environment-friendly roofs in Denver had 54 percent approval in final but unofficial returns Thursday. Denver joins San Francisco, New York, Paris, London and other global cities that require or encourage builders to put "green roofs" on large new buildings. Rooftop gardens and solar panels absorb some of the sun's heat or put it to work generating electricity.