The building sector has an important impact on air pollution, solid waste generation, water consumption, and wastewater production. Much of this is tied to the by-product of energy generation. In the developed world, people spend 90 percent of the time inside buildings. One means to reduce energy consumption in buildings is to reduce ventilation rates from outdoors. Occupants of many new commercial buildings suffer from deteriorating indoor air quality. The challenge is to develop sustainable buildings that reduce waste emissions to the outside while simultaneously improving environmental quality within the building. There are new technologies that will meet both requirements. Examples will be presented in later chapters.

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