Big Three emit the most greenhouse gas - Automotive - MSNBC.com: "With just 5 percent of the world’s population, the United States has 30 percent of the world’s automobiles and produces 45 percent of the world’s automotive carbon dioxide emissions, the report said. U.S. cars are driven more and burn more fuel per mile than the international average."
http://msnbc.msn.com/id/13591551/
