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Across 2. the energy source 6. to use up 7. the contamination 8. the development 9. toxic 11. renewable 14. the ozone layer 16. to preserve, to conserve 20. the natural resources 23. I protect 24. to destroy

Down 1. to harm, to damage 3. the global warming 4. it protects 5. harmful 10. the fuel 12. the environment 13. disposable 14. the deforestation 15. to waste 17. to do damage 18. to protect (g:j + a, o, u) 19. to disappear 21. it resolves 22. to solve, to resolve (o:ue)