green issues

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Across
  1. 3. dense forest found in tropical areas of heavy rainfall
  2. 4. existence of a wide variety of plant and animal species in their natural environments
  3. 8. poisonous
  4. 9. native
  5. 10. having died out
  6. 12. energy that comes from rivers and seas
  7. 15. contamination of the environment
  8. 16. the act of clearing trees from a forest
  9. 18. make unclean, pollute, poison
  10. 19. substances that increase soil's productivity
  11. 20. be in danger of extinction
Down
  1. 1. reduce
  2. 2. process of reusing waste materials
  3. 5. a form of oxygen providing protection from ultraviolet radiation
  4. 6. worldwide
  5. 7. protect
  6. 11. natural environment
  7. 13. release of gases from any process or industry.
  8. 14. The science of the relationships between organisms and their environments
  9. 15. substances that kill pests
  10. 17. sources that can be naturally replenished