（1）Man is destroying the world's rainforests at a fast speed.

（2）The forests are cut down for food and farms，and the forests may grow back.

（3）One reason why we should save the rainforests I s that they produce food.

（4）Without the rainforests.It is likely that the world's weather will get warmer than it is now.

（5）Before we try to understand the rainforests，we shall start saving them first.

（6）We needn't know why and how to plant trees and the forest Itself can grow again.