text: Pollution has become a large threat to the world today because of cars and their exhaust. Cars are said to cause twelve percent of the greenhouse gases found in the atmosphere. Paris enforced a driving ban on monday for even numbered license plates because of the near record pollution problem in the city. These people had to leave their cars at home or be fined a thirty-one dollar ticket. many still disobeyed and some had their cars impounded. this shows us that car pollution is becoming out of hand, and limiting your car use can help the enviornment and lower the amount of greenhouse gases in the atmosphere.