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"95% of roofs in America are asphalt shingles that are cheap, fossil fuel based, heat absorbing and don't last very long; then they are hard to get rid of. They have been called \"a disposable roofing system that is difficult to dispose of.\" But did we"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/renewable-energy/powerhouse-solar-shingle-is-clever-but-is-it-a-good-idea.html>