Across
- 3. renewable
- 5. recycling
- 7. radiation
- 8. overpopulation
- 10. poverty
- 11. ecotourism
- 13. avalanche
- 16. population
- 17. environment
- 19. source
- 20. consequence
Down
- 1. globalwarming
- 2. allergy
- 4. danger
- 6. sustainable
- 9. storm
- 12. cancer
- 14. hunger
- 15. ecosystem
- 18. Earth