text: Second, pollution is beginning to be a very big deal that can't be fixed, only stopped. The first article states that "Passenger cars are responsible for 12 percent of greenhouse gas emmissions in Europe and up to 50 percent in some car-intencive areas in the United States." In the second article "Paris Bans Driving Due To Smog" by Robert Duffer I learned that Paris enfored a patial driving ban to clear the air of the city. The smog went down by 60 percent.