Should cars be banned from the city-center?

I think that if we won’t ban cars from the city-center we will have serious pollution problem. Because of this pollution we have global warming in all Earth. Every day every people get up and drive to his work office in the center of the Town.
I think we should ban cars because every day new car is bought and City centers need’s a lot of parking space. There are several solutions to this problem.
First one is that we need to change fuel in our cars. Scientist our days are thinking about this idea. But there are only several cars on a hydrogen.
Second we need to change the limit of cars to the city centers. So that we won’t have accidents with pedestrians and we won’t have air pollution.
Third one all people must use public transport so it will reduce the air pollution in the city and in Earth. But this is a small change of reducing this pollution.
In the end I want to say that I do for you to remove the car from the city center. For smaller machines the less pollution. But until that moment had not yet done with hydrogen cars, we have to look for solutions other ways to combat air pollution.