Too many cars have created o lot of serious problems in our world. Besides congestion, accidents and fast fuel consumption are responsible for a good part of air pollution in big cities. All the time, they are pumping huge amounts of waste gases into the atmosphere. These gases are very harmful, causing disease and even death.
One possible solution is to design and develop clean cars and clean fuels. In Tsinghua University, campus buses are driven by electricity. In Beijing some of the public buses begin to run on natural gas, which does not give off as much carbon dioxide as the petrol.
Another solution is to develop modern public transportation systems and restrict the use of private cars. If the price of petrol rises constantly and the public vehicles are efficient and convenient enough, most people will not buy private cars. And the total number of cars in big cities will decrease greatly. On the whole, the elimination of air pollution needs the co-efforts from the government, the public and the environmentalists. This problem will be solved only with the help of science and technology.