too many car have caued a lot of eriou problem in our world. beide congetion, accident and fat fuel conumption, car are reponible for a good part of air pollution in big citie.
one poible olution i to deign and develop clean car and clean fuel. in hanghai, ome of the public bue begin to run on natural ga, which doe not give off a much carbon dioxide a petrol. another olution i to develop modern public tranportation ytem and retrict the ue of private car. if the price of petrol rie contantly and the public vehicle are efficient and convenient enough, mot people will not buy private car. thu, the total number of car in big citie will reduce greatly.
on the whole, the elimination of air pollution need the collective effort from the government, the public and the environmentalit.