Across
- 2. combat
- 5. benefit
- 7. risk
- 9. rescue
- 13. diminish
- 14. waste
- 15. contaminate
- 16. ton
- 19. sustainability
- 20. replace
Down
- 1. Acid rain
- 3. endangered
- 4. solar panels
- 6. model
- 8. human beings
- 10. temperature
- 11. conserve
- 12. birds
- 17. container
- 18. earth