Across
- 4. conserve
- 7. economize
- 10. threaten
- 13. preservation
- 14. improve
- 15. reduce
- 17. global warming
- 18. borrow
- 20. resources
Down
- 1. danger
- 2. renewable energy
- 3. recycle
- 5. overuse
- 6. heating
- 8. limit
- 9. spoil
- 11. energy saving
- 12. solar panels
- 16. emissions
- 19. protect