以 Why are trees important 写一篇英语作文

As we all konwn that the world becomes hotter now,one of the reason is that desertification and degeneration of the grassland is increasingly serious.So,the trees are more and more important than ever before.
On the one hand,planting trees shoule be brought to the forefront because the trees can stop the sandstorm when the weather is bad.On the other hand,the environmental pollution is attracted more and more attention by people in modern society.In the city,many trees are cut down and lots of buildings are coming out which can affect people's health.We must face up to the importance of the trees and we also should do something from ourselves.