text: The next reason is that increasing the use of cars will help the environment greatly. Passenger cars are responsible for 12% of greenhouse gases in Europe and 50% in the U.S. All of our development since World War 2 has been centered around cars and it hasn't helped the environment any. For example, in Paris they were going to have two no car days to reduce the smog. The first day they said that no one with and even numbered license plate were allowed to drive and odd would be the next. After the first day was over the smog was reduced by so much that they didnt't even have to use the next day. This is just a small number of people. Imagine if everyone would participate even just for small periods of time.