Today's personal transportation system is primarily based on oil extraction, refining, gasoline distribution, roads, and vehicles, but each of these could be challenged by climate change. Transportation solutions can be found in many policies and technologies. Increasingly, biofuels are becoming part of the system, and technologies such as cellulosic ethanol promise to displace a significant supply of oil. Plug-in hybrids and electric vehicles may effectively integrate the transportation system with the electricity system, also displacing oil. Land-use planning and public transit are key components of a larger transportation system that offers low-cost low-carbon options. CCPP research will focus on the three major options for reducing GHG emissions from the transportation sector - reducing vehicle miles traveled (VMT), decreasing the amount of carbon in fuels, and expanding the use advanced vehicle technologies.