What has been done or is being done to repair the ozone layer?

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Related questions

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  5. #faced
  6. #aimed
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  11. #refrigerators
  12. #ozone
  13. #hairspray
  14. #governments
  15. #chlorofluorocarbons
  16. #production
  17. #aerosol
  18. #protocol
  19. #growing
  20. #phase
  21. #global