text: Greenhouse gases have a tremendous effect on our atmosphere and the air that we need to have to be able to survive. In Paris, government officials put out a ban on what cars could be used on certain days to try and bring pollution levels down around the global city. The first day was fining motorists with even-numbered license plates after they were oredered to leave their cars at home. The same would be done to odd-numbered motorists the next day. The smog around the city cleared enough on Monday that the French party decided to lift the ban for odd-numbered motorists on Tuesday.