text: Company, cars are the "second largest source of America's emission" proving how much we rely on cars (source 4 paragraph 34).She also writes about numbers terrifying to the future generations. United States is responsible for 50 percent greenhouse gas emissions from tailpipes while Europe is only responsible for 12(source 1 paragraph 5). 50 percent is proof that Americans are too reliable on transportation sources like streets, main roads, and highways. Paris was able to clear the air from pollution. According to Robert Duffer from the