【正确答案】Nowadays more and more people have realized a fact: Too many vehicles, such as cars, tracks, motorcycles, have created a lot of serious problems in our world. Besides congestion, accidents and fast fuel consumption, they are responsible for a good part of air pollution in big dries. All the time, the vehicles are pumping huge amount of waste gases into the atmosphere. These gases are harmful to health and life-threatening.
For my part, one possible solution that may reduce air pollution created by so many vehicles is to develop more modern public transportation systems in cities and restrict the use of private cars to a more rigorous extent. If the price of petrol rises constantly and the public vehicles are efficient and convenient enough, most people will not try to have their own private cars. Thus the total number of cars in big cities will reduce greatly. People would find more room to walk, to jog, to perform what they used to do in the open air. Moreover, dirt, noise, exhaust, parked cars, and smog would decrease greatly.
Of course, there is no inherent incompatibility between man in an urban setting and the automobile. But we don't want cars to seize our living space and endanger our well-being. We take it for granted that everyone could enjoy the pleasure of stretching his legs freely, breathing and sniffing the fresh air cheerfully. And the elimination of air pollution needs the co-efforts from governments, organizations, the public and the environment itself.