Green Roofing

Green Roofs: Building for the Future
http://www.truthout.org/issues_06/030607EC.shtml

From the US Food and Drug Administration building in Washington, DC, to Heinz Corporate headquarters in Pittsburgh, Pa., an increasing number of buildings are swapping shingles for sedums. The movement is called green roofing, but, far from an industrial paint job, it evolves around technology that's ecologically sound - and proving so useful that some major cities and the entire state of Maryland are eagerly exploiting the potential of this once-forgotten facade.