Large forests are important to us in many ways. They give us wood for building and heation. they are a home for many kinds of and plants and animals. And for many city people, forests are a place to go for a vacatione. They can breathe fresh air and sleep in a quiet place. But there is one more reason why forests are imprtant for everyone. The leaves on the trees in a forest help clean the air.Dirty air is a problem in many parts of the world.