Across
- 4. an environmental problem.
- 9. friendly not bad for the environment.
- 10. animals, birds, insects, etc. that are wild and live in a natural environment.
- 11. a solution to environmental problems.
- 13. at risk of no longer existing.
Down
- 1. to keep something safe from death, harm or loss.
- 2. animals that are not pets or farm animals.
- 3. to reuse things that have already been used.
- 5. to stop something from happening.
- 6. the process of making air, water, soil, etc. dirty; the state of being dirty.
- 7. a noun that means the air, land and water where people, animals and plans live.
- 8. a verb that means 'destroy' or 'spoil'.
- 12. to make sure that something is not harmed.