Number of cars and light trucks on U.S. roads.
Total vehicle miles traveled in the U.S. in 2006.
Increase in the amount of miles driven since 1970 in the U.S.
Amount spent by local, federal and state governments on U.S. highways in 2005.
U.S. share of the world's population.
U.S. share of world's total global warming pollution from vehicles.
Percent of U.S. global warming pollution coming from transportation.
Number of states that have adopted California's global warming pollution limits on cars.
The Big Three car companies (GM, Ford and Chrysler) that have joined USCAP, a partnership calling for a US national cap on global warming emissions.
Number of federal bills passed to cap and reduce America's global warming pollution from all sources.