(1) A Chinese man called Cai Lun invented paper about 2,000 years ago. He made it from wood. He took the wood from trees and made it into paper. He then put these pieces of paper together and made them into a book.

Now paper still comes from trees. We use a lot of paper every day. If we keep on wasting paper, there will not be any trees left on the earth. If there are no trees, there will be no paper. Every day, people throw away about 2,800 tons of paper in our city. It takes 17 trees to make one ton of paper. This means that we are cutting nearly 48,000 trees every day. Since it takes more than 10 years for a tree to grow, we must start using less paper from now on. (2) If we don't, we will not have enough time to grow more trees.

So how can we save paper? (3) Some people suggest we should use both sides of every piece of paper. We can also choose drinks in bottles instead of those in paper. We can also use cotton handkerchiefs (手帕) and not paper ones. (4)当我们逛街时，我们可以使用更少的纸袋子。If the shop assistant gives use paper bag, we can save it and reuse it later.

Everyone can help to save paper. If we all think carefully, we can help protect trees. (5)让我们现在采取行动节约用纸。