Across
- 3. Replanting trees in a deforested area.
- 4. Study of the ocean's physical and biological aspects.
- 5. Animals living in their natural habitat.
- 6. Campaigning for social or political change.
- 11. Element central to climate change discussions.
- 12. Structure for growing plants or regulating temperature.
- 13. Release of gases into the atmosphere.
- 15. Clearing of trees from an area.
- 16. Permanent disappearance of a species.
- 17. Natural environment where an organism lives.
- 19. Publicly support a cause or policy.
- 20. Energy sources that can be replenished.
Down
- 1. Variety of life in a particular ecosystem.
- 2. Remains or impressions of ancient life forms.
- 7. Patterns of weather conditions over a long period of time.
- 8. Extended period of low rainfall.
- 9. Protection and preservation of natural resources.
- 10. Greenhouse gas produced by agriculture.
- 14. Ability to meet present needs without compromising the future.
- 18. Large mass of ice moving slowly over land.