Too many cars have created a lot of serious problems in our world. Besides congestion， accidents and fast fuel consumption， cars are responsible for a good part of air pollution in big cities. All the time， they are pumping huge 十堰癫痫病医院哪家比较好啊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 Shanghai， some of the public buses beg河南哪个医院治癫痫病比较专业in to run on natural gas， which does not give off as much carbon dioxide as the petrol. But it may take decades for the new models of clean cars completely replace the traditional ones. Another solution is to develop modern public tra山东哪家癫痫病医院比较好nsportation 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 商丘癫痫医院哪里的好cities will reduce greatly.
On the whole， the elimination of air pollution needs the collective efforts from the government， the public and the environmentalists.