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