Across
- 2. serious
- 5. peace
- 7. war
- 9. dangerous
- 12. to turn off
- 13. help
- 15. hill
- 17. to increase
- 19. global warming
- 20. waste
Down
- 1. to damage
- 3. to fight
- 4. oil spill
- 6. to save (as in to keep)
- 8. forest
- 10. to injure oneself
- 11. cans
- 14. to join (become member of)
- 16. world
- 18. to improve