Across
- 3. Conservationist protests for protection of nature
- 6. Outside earths atmosphere
- 8. surprisingly small
- 9. dense population
- 12. thing made by humans
- 13. exact
- 16. policy makers
- 17. eating and drinking
- 18. scientific knowledge
Down
- 1. home
- 2. eco friendly
- 4. deny
- 5. almost practical
- 7. help
- 9. study of nature
- 10. examining something
- 11. Emission release
- 13. less water
- 14. Aspects of mechanical air-craft
- 15. unexpected meetings with stuff