writing blog 2

Some people will say that cars give us convenience in life. Maybe it is right, but I think cars give us what are more problems.
    First of all, one of the serouse problems is traffic jam. Nowadays people make great progress in live level, it brings mass productivity of cars and  mass purchasing power. It makes cars can see wherever you are. Cars only give us convient when we go out, but give us more unconvenient. In many big cities, a lot of office clerks and students have wasted much time because of traffic jam. Therefor, an advantage of cars is bring convenience, it will be doubtful.
    Second, cars also bring us many environment problems, like air pollution, noisy pollution. Air pollution is more and more serious and cause many diseases, like cardio-cerebral vascular diseases, tuberculosis. what is more serious is that air pollution is becoming an important reason of global warming. Cars always have whistle and noisy of engine, and it lead to a great puzzle for us.
    Finally, existing of cars also gives us many threaten of personal security. According to the research, every year it has 19 percent of people died from accident in the all over the world. It is a matter of cars.
    Cars give us a heavy traffic jam pressure, wasting time, environment problems and personal security and so on. All in all, in my opinion, I think cars give us many problems.