On March 15, the Department of Energy’s Transportation Energy Futures (TEF) project said that concerted action by the transportation sector and vehicle users could reduce petroleum usage and greenhouse gas emissions by 80 percent or more by 2050. TEF, which has identified possible paths to a low- petroleum, low-carbon future in a series of nine reports, said that the transportation sector currently accounts for 71 percent of the total U.S. petroleum consumption and 33 percent of total U.S. Carbon emissions.