KEY CONCEPTS CROSSWORD

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Across
  1. 4. chernobyl
  2. 11. Nobel peace 2007
  3. 12. "Nature"
  4. 16. John Muir founder
  5. 17. Defened Sacreed trees
  6. 19. Industrial waste
  7. 20. Industrial revolution
Down
  1. 1. humans
  2. 2. Became a legal requirement
  3. 3. Vaccine
  4. 5. Rachel Carson
  5. 6. Natural Disaster
  6. 7. protect the ozone layer
  7. 8. James Lovelock
  8. 9. International organization working on the conservation and sustainable use of natural resources.
  9. 10. technology
  10. 13. Infection rates calculation
  11. 14. nature
  12. 15. April 22
  13. 18. Green Revolution