The earth is our home;we must take Care of it. This means keeping the land,air and water   clean. Pollution is a dirty word. To pollute means to make things unfit or unclean to use. Pollution comes in many ways. We see it,smell it,taste it and drink it. Pollution is beginning to threaten our health,or happiness and our life. Man. has been polluting the earth from the time he first made fire,washed his clothes in the river and threw his waste on the ground. When land was used up or water became dirty. Men moved to another place. At first the problem was not so serious because there was plenty of clean air,land and water. There weren't so many people then and their wants were fewer. All the dirty things could be absorbed by nature and soon. covered over , But this is no longer true. The increase of population and the development of industry have changed that. Man is slowly polluting. his environment. Through the use of poison ,mall has polluted land! killing the animal. By putting dirty water and _ into rivers and lakes we have polluted our drinking water,killing the fish. Our increasing population is part of the problem. More people more waste. Where is this all to end? Are we turning the world into a big rubbish dump,or is there any hope that we can get rid of the pollution ?Luckily,millions of people have been warned of the danger of pollution. Large numbers of people are now working hard to bring pollution under From the passage we can know that now man  _  .
doesn't know how to control pollution still doesn't realize how serious pollution is is doing something to control pollution begins to understand the pollution