text: A large amount of the harmful greenhouse gas emissisions that surround the earth come directly from cars.  According to source 1 "Passenger cars are responsible for 12 percent of greenhouse gas emissions in Europe... and up to 50 percent in some car-intensive areas in the United States."  By ending the use of even a fraction of our car usage we would drastically improve the amount of gas emissions produced.  This improvement would mean healthier air and a healthier O-zone.