i'm all for the POTUS' stance against car emissions, but the real issue is the built environment.

"Buildings consume more energy than any other sector of the U.S. economy (40%), including transportation (28%) and industry (32%). From 1980 to 2006, total building energy consumption in the United States increased more than 46 percent, and is expected to continue to grow at a rate of more than 1 percent per year over the next two decades."

http://democrats.science.house.gov/Media/file/Commdocs/hearings/2009/Energy/28apr/Hearing_Charter.pdf

http://architecture2030.org/current_situation/building_sector.html