Across
- 3. drought
- 4. planet
- 6. to threaten
- 9. to replace
- 10. to decrease
- 12. to suport
- 13. environment
- 16. to protect
- 18. to value
- 20. development
Down
- 1. ground
- 2. oil
- 5. ozone layer
- 7. future
- 8. to reuse
- 11. to breathe
- 14. to keep informed
- 15. invention
- 17. erosion
- 19. to vote