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Rooftops on new buildings built in commercial zones in France must either be partially covered in plants or solar panels, under a law approved on Thursday.
Green roofs have an isolating effect, helping reduce the amount of energy needed to heat a building in winter and cool it in summer.
They also retain rainwater, thus helping reduce problems with runoff, while favouring biodiversity and giving birds a place to nest in the urban jungle, ecologists say …. http://www.theguardian.com