It is clear that the earth is our home and we should protect it.We should stop polluting our earth, and try to make it clean. Needless to say ,there are many ways to protect the earth.First and foremost ,no one can deny  that we should not throw away rubbish everywhere.What's more ,it is obvious that we should plant more trees because trees can make the air clean and make the world beautiful.Last but certainly not least,We should try to ride bikes or take buses .In conclusion, we should try our best to protect the earth.