二、Harm to humans：
1) not enough food or water
1) stop cutting down trees
2) use paper on both sides
In recent years there have been many natural disasters caused by human activities, such as
In recent years there have been many natural disasters caused by human activities, such as, floods, droughts, earthquakes and sand storms.
These natural disasters do great harm to humans. We don't have enough food or water. Many people even lost their lives and became homeless. The climate of the world becomes worse and worse.
It is time for us to take action to protect our planet. We must stop cutting down trees and hunting animals. We have to save water and use paper on both sides. We must try our best to save energy. If we don't do these, we will have nowhere to live. Even a small action is meaningful to our planet. Come on and join us!