say that

　　deforestation

　　(砍伐树林)

　　has____2___effects on the environment.

　　One of the major disadvantages of deforestation is that it___3___the water cycle. Trees are___4___for drawing water from the soil and releasing moisture (水分) into the atmosphere. Deforestation disturbs the water cycle and makes the environment____5___. Climate change is a(n)___6___of cutting down too many trees.

　　Burning of forests___7___a large amount of carbon dioxide and other greenhouse gases, which are known for trapping atmospheric heat,____8___increasing the average temperature of the earth surface. The rise in the average temperature of our planet is bound to____9___sea level.

　　Global warming has already begun causing the___10__ of the ice at the poles, thus adding

　　to the rise in sea level.

　　Animals___11___trees or other plants. By cutting down trees, we___12__ animals of their sources of food and cause the destruction of animal life.

　　It can lead to the____13___ of a variety

　　of animal species. Global warming that is largely caused by deforestation___14__ endangers plants and animals.

　　It is believed that the use of fossil___15__—oil and gas—causes global warming. But research has revealed that deforestation is one of its major___16__. It is the main reason behind the___17__ of greenhouse gases in the atmosphere,___18__ to the greenhouse effect. So, we need to show greater___19__ for deforestation. We need to take measures to___20__ deforestation so that we can hope for a better environment.

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