Across
- 1. to reuse
- 3. efficiency
- 4. to reduce
- 9. to save
- 10. natural environment
- 12. ecological products
- 13. isolation
- 15. raw materials
- 18. consumption
Down
- 2. natural resources
- 5. energy
- 6. toilet
- 7. sustainability
- 8. location
- 11. renewable
- 14. heating
- 16. recycle
- 17. the green zone/area