...people have been living here long time," says Simon, "and one day they had a green roof to look at instead of city construction."

Green roofs are usually flat, and partially or completely covered by soil and plants. Germany and Japan have incorporated them into building projects for many years, and they are now becoming popular in eco-minded cities in the U.S. According to the Green Roofs Institute, total coverage in North America climbed from 1.3 to 2.5 million square feet between 2004 and 2005. Green roofs lower cooling...

NOTE: All illustrations and photos have been removed from this article.



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