Adv. A

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Across
  1. 3. tropical forest
  2. 4. serious
  3. 8. electricity
  4. 11. shortage
  5. 13. seal
  6. 15. extinction
  7. 17. atmosphere
  8. 18. hole
  9. 19. skin
  10. 20. ozone
Down
  1. 1. lack
  2. 2. wild
  3. 5. bird
  4. 6. excessive
  5. 7. feather
  6. 9. threat
  7. 10. species
  8. 12. weather
  9. 14. hunting
  10. 16. due