There exists a category of American cities in which the line between suburban and urban is almost impossible to locate. These suburban cities arose in the last half of twentieth-century America, based largely on the success of the single-family home, shopping centers, and the automobile. The low-density, auto-centric development of suburban cities, which are largely in the arid West, presents challenges for urban sustainability as it is traditionally measured. Yet, some of these cities--Los Angeles, Las Vegas, Phoenix, Salt Lake, Dallas, Tucson, San Bernardino, and San Diego--continue to be...