"Many believe that to have a green building, everything must grow out of the newest technologies. This approach solves one problem by introducing another: Demolishing old buildings is inefficient. When a building is torn down, its "embodied energy"--the energy already exerted to create and gather the materials, and then construct the structure--is wasted. Moreover, materials from that demolished building could end up in a landfill. The National Trust for Historic Preservation estimates that one-quarter of the municipal waste stream consists of construction debris. And according to a 2004 report by the Brookings Institution, such demolition could add up to a big problem: About one-third of the U.S. building stock will be taken down and replaced by 2030."
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