The world is becoming much smaller by using modern communication means. Life today is much easier than it was hundreds of years ago, but it has brought new problems. One of the biggest problems is pollution, which means making things dirty. Pollution comes in many ways. We see it, smell it, drink it and even hear it.
Man has been polluting the earth. The more people, the more pollution. Air pollution is the most serious. It's bad for all living things in the world, but it is not the only kind of pollution. Water pollution kills fish and pollutes our drinking water. Noise pollution makes us angry more easily.
Many countries are making rules to fight pollution. They stop people from burning coal in houses and factories in the city, and from putting dirty smoke into the air. Pollution by SO2 is now the most dangerous kind of air pollution. It is mainly caused by heavy traffic. We are sure that if there are fewer people driving, there will be less air pollution.
