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WASHINGTON, DC—One-tenth of the world's greenhouse gas emissions spawn from the walls around you—or at least, the construction of them, reports a recent Urban Land Institute report. For example, Portland, OR, is home to America's tallest building made of lightweight timber. By using timber derived from natural forest waste, multifamily developers cut carbon emissions by 223 metric tons—the equivalent of taking 50 cars off the road.

"So often, the industry wants to reduce building efficiencies and electrical efficiencies but the building's carbon footprint is rarely considered," observes Marta Schantz, senior vice president of ULI's Greenprint Center for Building Performance.

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