Across
- 3. phosphorus
- 4. energy
- 5. forest
- 9. global warming
- 14. ecosystem
- 16. planet
- 17. climate
- 18. to recycle
- 21. environment
- 23. fertilizers
- 26. grass
- 28. sun
- 29. flower
- 30. deforestation
- 31. scientist
- 32. carbon
- 33. to conserve
Down
- 1. biodiversity
- 2. plant
- 6. plantations
- 7. habitat
- 8. river
- 9. fossil fuels
- 10. ecology
- 11. nature
- 12. ocean
- 13. sky
- 14. species
- 15. conservation
- 19. atmosphere
- 20. contamination
- 22. nitrogen
- 24. acidification
- 25. tree
- 27. alimenticia food chain
