One possible version:
Have you ever heard of Earth Day?It's celebrated all over the world on April 22nd.
Earth Day is a very special day.It makes all of us think about problems we made for the earth.Why do we celebrate Earth Day?Because we have only one earth and it's our home.It's getting very dirty.It's our duty to protect our beautiful home.Earth Day is a day to call on people around the world to save the earth.
We should do something that we can do to protect our earth,such as planting a tree ,cleaning up a park,picking up the rubbish and so on.