No different than requiring proportions of parking spaces: here’s one way to push the solar deployment curve up faster and hasten the year that most of the world’s power comes from the sun.
Agence France-Press 19 March 2015, France decrees new rooftops must be covered in plants or solar panels,
Green roofs have an isolating effect, helping reduce the amount of energy needed to heat a building in winter and cool it in summer. The argument for divesting from fossil fuels is becoming overwhelming Read more
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.