2. The Environment

3. Pollution Factories, power station and motor vehicles pump large quantities of carbon dioxide and other waste gases into the air.

6. A Chemical Reaction

7. Acid rain damages trees and buildings, and can kill fish in rivers and lakes.

8. What can be done?

9. We should stop cutting down trees!

10. Alternative Forms Of Energy.

11. Hydroelectricity

12. Recycle papers, aluminium cans and other containers.