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Enhance efficiency. Shift energy sources. Address refrigerants.

Inside is where most people are most of the time. As central features of human life, buildings furnish space in which to dwell, gather, labor, trade, make, learn, heal, and revel. Of all the things we create, buildings are the largest, and they generally persist for decades, if not centuries. Already the world has more than 230 billion square meters of building space. Another 65 billion square meters could be added this decade.

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