The earth is our home. We must take care of it. Life today is easier than it wasyears ago, but it has brought some new problems. One of the biggest problems is pollution（污染）. We can see it, smell it, drink it and evenit. Man has polluted the. The more people, the more pollution.Many years ago, the problem was not so serious because there were not sopeople. When the land was used up (用光), the river was not clean in a place,man went toplace. Now man is slowly polluting the whole worldpollution is still the most serious, it’s bad forthings in the world.Many countries don’t le t people burnfor air in houses and factories in the city. Pollution by SO2 is now the most erous kind ofpollution. It’s caused by heavy traffic. People say it’sto ride bikes. When you are, there is no pollution. But even in developed countries, most people don’t go to work by bike. It’s notbikes are expen sive or people are tired if they ride to work. It’s because the number of cars on the roads becomes larger. So more peopletheir bikes and go to work by cars, then things are getting. We should have special roads only for bikes and make itdifficult and expensive for drivers to take their cars into the city that they will go back to use their bikes.
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