Transportation emissions primarily result from the amount of miles that Californians drive their cars and light trucks. The vehicle miles traveled (VMT) are in turn directly related to the state’s auto-centric land use policies that discourage development that promotes walking, biking, and transit. Improving fuel economy and the carbon content of fuel alone will not solve the problem. The state therefore needs land use policies that encourage sustainable development. Sustainable development refers to resource efficient land use where residents live within walking distance of key services and mass transit and where neighborhoods contain a compact mix of uses, such as housing, office, and retail.