Road-based transportation, from passenger vehicles to freight trucks, accounts for one-third of U.S. emissions, and is growing faster than any other source. Conventional urban design is fueling much of this growth.

Across the country local governments are demonstrating smart green neighborhood planning can reduce automobile dependence and increase community livability. 

Portland, Oregon, is one of the few local governments in North America within reach of returning to 1990 emission levels. This success is largely attributed to policies that support the development of complete neighborhoods that include schools, work and commercial and residential activity. This design enables walking, biking or transit use rather than just automobile mobility.