1. If we conserve water, we will not face serious water shortages.
2. Because of the awful weather, we didn't enjoy our camping holiday.
3. Since plastic bags are non-biodegradable, they will remain in the environment for many years.
4. If Paul doesn't think about the planet, he will waste so 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 will 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.
