1.most americans would find it hard to think what life
2.would look like without a car .but,some have realized
3.the serious question of the pollution caused by the car .
4.the polluted air becomes harmful and dangerous to health .
5.one way to getting rid of the polluted air is to build a
6.car that does not pollute .that is how several of the
7.large car factories have been tried to do .but to build a clean car is more easier said than done .