Green roofs are roofs of a building or house that is partially or completely covered with vegetation and soil, or a growing medium, planted over a water proofing membrane. They are a really affective way of cooling down a a city. It also beneficial because is serves as a insulating membrane to a building or home from the sun's rays and water damage. There are two types of green roofs, and intensive roof, which is much deeper and recuires more maintance, and a extensive roof, which is only 2-4 inches deep and is more self-sufficient.
Green roofs should definitely be supported, maybe they could even be tax deductible, similarly to hybrid cars are now on the market. As far as the wedge, this could forfill the reforestation technology, which would be created by establishing around 300 million hectares of plantations on non forested land.
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