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Across
  1. 3. Illegal movement of goods or people.
  2. 4. Ability to maintain or sustain something at a certain level or rate.
  3. 6. Contamination of the environment by harmful substances.
  4. 9. Film or television program presenting facts about a real-life situation.
  5. 13. Close observation, especially of a suspected spy or criminal.
  6. 14. Natural environment where an organism lives.
  7. 16. Complete disappearance of a species.
  8. 17. Community of living organisms interacting with each other and their environment.
  9. 18. Efforts to bring about social or political change.
  10. 19. Act of keeping something safe from harm or loss.
Down
  1. 1. Against the law or regulations.
  2. 2. Tools or methods used to solve problems.
  3. 5. Conditions of the atmosphere over a long period.
  4. 7. Public support for or recommendation of a particular cause or policy.
  5. 8. Variety of life on Earth.
  6. 10. Knowledge or perception of a situation or fact.
  7. 11. Species at risk of extinction.
  8. 12. Species crucial for maintaining ecosystem balance.
  9. 15. Protection and preservation of natural resources.
  10. 17. Process of acquiring knowledge or skills.