April 22 is the earth day. People all over the world think about our planet. But they say over planet is in danger. Many people do not no how to protect the earth. Some people's activities do a lot of harm to the forests. We polute rivers with pestisids. Many factories send a lot of smoke into the atmosphere.the way people live has changed the climat on our planet. So, the problem is now is to protect life on earth, and to save our planet for the future.