joyce's notebook entry: Feb 02, 2011 As we know，trees is very important to our daily life .But many people have cut down too many trees and a lot of rich land change into desert .Maybe you have a question ？how can these trees affect the weather？ First trees can stop the wind from blowing the earth.Second a lot of water can be saved by forests.In the end of they can also prevent the water from washing the earth away.Cutting down trees is harmful to human begings ,animals and plants.So we can plant to many trees and sill need to work hand to protect the environment.