写一篇英语小作文,有关于家乡的污染,主要内容大概是家乡有哪几种污染?是怎样形成的?

Our hometown used to be very beautiful.But now it is poluted.
The environment in our hometown is very important for our lives .We need the fresh air,the clean water and so on .In the past,there were many trees around us ,the air was fresh and the river was clean.But now,people cut down many trees.Air pollution and water polloution are very serious .The environment around us becomes very terrible.
We should do something to protect the environment.