Across
- 7. plastic pollution
- 9. greenhouse effect
- 13. climate change
- 14. solar energy
- 15. earth
- 16. natural resources
- 18. nature
- 22. soil pollution
- 26. ecosystem
- 27. worldwide
- 28. biodiversity
- 29. Recycling
- 30. sustainable farming
Down
- 1. global warming
- 2. issue
- 3. endangered species
- 4. sustainability
- 5. world
- 6. water cycle
- 8. wind energy
- 10. plastic recycling
- 11. trees
- 12. air pollution
- 17. drinking water
- 19. pollution
- 20. renewable engergy
- 21. deforestation
- 23. erosion
- 24. sustainable development
- 25. waste