In recent years, the forests have been getting smaller and smaller for more and more people cut down trees for money. As trees grow naturally, people don't need to invest anything on them. But cutting down trees has destroyed our nature. We have already seen the bad consequence. For example, we always suffer from the flood and drought disaster; many animals are facing the danger of dying out, because their habitats have been destroyed; deserts are expanding, and sandstorms are emerging. Our environment has been changed from bad to worse due to the reduction of forests. Thus, the government should appeal people that cutting down trees breaks the balance of our nature. Those who continue to cut down trees should be punished severely.