How are forest are useful to us?

How are forest are useful to us?

Uses of forests:
i. Forests purify air by utilizing carbon dioxide in the atmosphere.
ii. Forests maintain a balance between oxygen and carbon dioxide and prevent global warming on earth.
iii. Forests are a source of many medicines.
iv. Forests provide spices like black pepper, cardamom, cinchona, cinnamon, etc.
v. Forests provide medicines.