Across
- 4. recycling
- 5. energy conservation
- 7. landfill
- 10. biodiversity
- 12. hydroelectric
- 13. reserves
- 15. active
- 17. geothermal
- 18. pollution
- 20. nuclear
- 21. fossilfuels
- 23. petroleum
- 26. agriculture
- 29. fusion
- 30. ecology
- 31. biodegradable
- 34. fuel cell
- 35. hazardous
Down
- 1. fission
- 2. electric generator
- 3. commons
- 6. sourcereduction
- 8. biomassfuel
- 9. agricultural
- 11. energy efficiency
- 14. environmental science
- 16. eco footprint
- 19. industrial
- 22. supply and demand
- 24. sustainability
- 25. passive
- 27. renewable
- 28. solidwaste
- 32. alternative energy
- 33. natural