More and more family has their own cars, but the problem following appears:
The first one is the air pollution. As we know, most of the cars are driven by energy from burning gas, and the exhaust are made of many kinds of injurant which can cause health problem of people and pollution on enviorment. The people died of lung disease is becoming more and more, the sky is becoming grey and the water gets dirty.
The second is the energy shortage. The car is using gas to create power every minute when it is running, but the energy in the world is limited. There will be one day that the energy is used up.
The third one is the traffic jam. As urban residents, all of us must have experienced the boring traffic jam, thousands of cars have to slide very slowly in rows in the road due to the limited road resource while more and more cars.
