As we all know, earth is our friend. It gives us fresh air and water. It provides us with oil and coal so that we can make lots of useful things and start the machines. With the help of the earth, the world is developing quickly. Meanwhile, the environment on the earth has been destroyed seriously. It’s our duty to protect our earth. Stop cutting down the forests and never polluting the environment are two important things we should do at once. We ought to look the earth as our friend all the time because of its kindness to us.                              Ç®ÄÜ