Green Roofs
Green roofs or eco-roofs (planted roofs) are rooftop gardens, parks or meadows that carry a host of environmental and economic benefits. Soil and plants are placed on rooftops which otherwise would be left bleak.
Benefits to green roofs are:
Public benefits such as aesthetic improvement because the building and their environment get a better 'look'.
Waste diversion by prolonging the life of waterproofing membranes, reducing associated waste, using recycled materials and prolonging the service life of heating, ventilation and HVAC systems because their use decreases.
Stormwater management because the roofs now retain water , moderate the temprature of the water and also filter the water. Moreover they reduce the amount of stormwater runoff and delay the time at which runoff occurs.
Moderation of the urban heat island effect by cooling cities in summer and by covering the hottest surfaces in the urban environment (black rooftops).
Improved air quality because the plants on green roofs capture pollutants, filter noxious gases and moderate tempratures around buildings coverde with green roofs.
Greenroofs have 12 small advantages and up till now there ia no other method that combines all these advantages at once. They do have an important disadvantage: they are costly.
http://environment.about.com/od/greenlivingdesign/f/what-are-green-roofs.htm
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