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 Link: http://www.greengridroofs.com/Pages/videos.htm#Bright Idea roof systems are designed to save heating/cooling costs while roof gardens enhance the immediate environment, moderating both building and local environment temperatures. Both of them will lift people's spirits through light and plants. Both use roof area, but they should make great partners! In my Foursquare Cabin design (under the Photos tab) you can see how they get along side-by-side. The roof garden over the garage makes sense -- if the roof garden leaks, it won't ruin your interior decor.
"The U.S. Department of Energy estimates that buildings account for more than 37% of the energy consumed in the United States each year. The obvious focus on lighting, windows and mechanical systems has yielded significant operating efficiencies. Yet the quest for even greater building performance remains an issue. Cities, such as Chicago and Portland, major corporations and universities are just a few of the growing number of organizations that are looking up for an answer. Up, that is, on the roof." --GreenGrid
Another very active site is http://www.greenroofs.com/ with updated info on the world of green roofs. 
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