Across
- 3. – natural resources
- 7. - reforestation
- 9. - carbon footprint
- 12. – renewable energy
- 13. – pesticides
- 15. - biodiversity
- 16. - global warming
- 17. –ecosystem
- 18. – second-hand
- 19. - endangered species
Down
- 1. – ozone layer
- 2. – recycle
- 4. - environment
- 5. - waste
- 6. – fossil fuels
- 8. – eco-friendly
- 10. - greenhouse gases
- 11. - habitat
- 14. – pollute
- 20. - sustainable