text: Transportation is the second largest source of America's emmisions and it caused Paris to ban driving for a little while due to smog, environmental conditions worsen by the day and it is apparent. Yet we still drive our fancy cars around like there isn't a problem. "Passenger cars are responsible for 12 percent of greenhouse gas emmisions in Europe and up to 50 percent in the U.S." states Elisabeth Rosethal from the article "In German Suburb Life goes on without cars." That is a lot of pollution entering our atmosphere.