以 Saving the earth 为题写一篇短文（60词左右）

Saving the Earth
Our earth is not what it was before.In the past,it was very beautiful covered with trees and grass and surrounded by fresh air.We lived a healthy and happy life on it,without pullution.
But with the development of economy,many facotries have been seen set up,pouring poisonous gases and water into rivers and lakes every day.Many fish are killed and crops are damaged.
We have only one earth.We should do something to protect it.As students,we should not use plastic bags when shopping.We should not litter everywhere.We should save water and use two sides of paper.