Several companies are introducing new green construction materials in response to growing demand from consumers. Canada's Skyline Contracting, for example, offers roofing tiles made of rubber from recycled tires. The tiles cost up to three times more than traditional tiles, but company executives say they save money over time by cutting heating and cooling costs. Observers expect interest in the tiles and other green technology to grow as architects and building owners learn more about the cost and environmental benefits.

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