My childhood teacher told me that we should protect the earth. However, nowadays, people are killing animals and cutting down trees. These behaviors have caused damage to the environment. We live on the earth, we need to create a better environment because to protect the earth is to protect ourselves.
With the rapid development of the economy, many factories discharge pollutants into the environment. Many years ago, we could see birds flying in the sky and fish in the clear river. Now, however, there are fewer and fewer birds and the river is dirty. We urgently need to protect the environment.
When we look up at the sky and no longer see as many birds as we did many years ago, we realize that there are fewer and fewer of them, and it is difficult for us to find traces of them. The environment has been polluted and the earth has been damaged. We must protect the earth, forbid dumping rubbish and stop cutting down trees.