text: All, four passages mention that an up side of limiting car usage would reduce pollution around the world.  In paragraph five it mentions that "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 reducing the amount of cars driven in these areas we could reduce the amount of polution.  Due to large amounts of smog created by polution in France, banning was put on drivers with even license plates for one day. This is shown in paragraph 19, "The smog cleared enough Monday for the ruling French party to recind the ban for odd-numbered plates on Tuesday." This shows how much can change in just one car-free day.