In recent years interest has grown in Smart Growth as a mechanism for improving environmental quality. In Our Built and Natural Environments, the U.S. Environmental Protection Agency (EPA) summarizes technical research on the relationship between the built and natural environments, as well as current understanding of the role of development patterns, urban design, and transportation in improving environmental quality. Our Built and Natural Environments is designed as a technical reference for analysts in state and local governments, academics, and people studying the implications of development on the natural environment.