As we all know, life today is much easier it was hundreds of years ago, but at the same time, there are many new problems today. One of the （big）problems is pollution. Pollution comes in many different forms（形式）. We see it, drink it and even hear it.
The pollution is （get） more and more serious. The more people there are, the more pollution there is. A long time ago, pollution wasn't so serious there were not so many people, but now, humans are polluting the whole world.
Many countries are making （rule） to fight against pollution. They stop people from using coal（煤炭） in houses and factories, and from putting dirty smoke into the air. They also advise people to use their cars less and go to work by bus, bike or even on foot.
