XI.
1. If we dont conserve water, we will face serious water shortages
2. Beacause the awful weather, we didnt enjoyour camping  holiday
3. plastic bags will remain in the environment for many years since they are non biodegradable
4. If paul thought about the planet, he wouldnt wasteso much water
5. Water pollution happens lead to many aquatic animals such as fish can die.

6. Because the climate is changing, the earth is getting warmer.

7. Unless we stop cutting down so many trees, we endanger our oxygen supply.

8. When people begin to recycle, they generate much less trash.

9. Even though the ozone layer is necessary for human existence, we are damaging the ozone layer.

10. Sue was exposed to radiation when she was young, so she is suffering from skin cancer.