1. If people took bottles, newspapers and cans to special bins, they could be recycled.
2. If I were you, I would join Greenpeace.
3. If we didn't pollute our seas, they would be full of fish.
4. If l were you, l would continue the exploration.
5. If you had read these books, you would know more about this environmental problems.
6. If we had protected the environment seriously, our planet would be out of danger.
7. If people had avoided damaging nature, many species of animals wouldnt have disappeared.
8. If she had heard the conversation, she wouldnt have come there.