Across
- 3. in the vicinity of, nearby
- 4. deeply affect
- 6. change over time
- 8. use again
- 11. scale down
- 15. smog, for example
- 16. dirt
- 17. sun-powered
- 18. organic farmer's fertilizer
Down
- 1. garbage, trash, unusable
- 2. prevailing weather conditions
- 5. oxygen producers
- 7. harmful precipitation
- 9. our planet
- 10. coal and oil, _____ fuels
- 12. animals that expel methane gas
- 13. large wooded area
- 14. air current