With developing of economy, there are increasing cars on the roads. As we all know, it is saving time that is very important for us in this modern society, so we can take advantage of cars to achieve this aim. In addition, we are also able to take car to anywhere that is not very far for us. It is good to expand our field of vision. On the other hand, because of increasing of cars, the population of cities is more and more serious. The invisible gases that cause acid rain usually come from automobiles. And in the rush time, It also has an important problem that traffic jams give us deeply bad effect. In my opinion, we should absorb the essence and discard the dregs. Rather than trying to find ways to control pollution and other wastes, it makes more sense to find new sources of energy which do not produce them. There are quantities of new available energies which are waiting for us to discovered and use. Then expanding the roads and control numbers of cars on the roads are good methods to solve traffic jams. In conclusion, we should spare no effort to make our world to become a wonderful world.
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