Are greenhouse gases harmful?

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Related questions

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  4. What is the biggest contributor to greenhouse gases?
  5. How do CFCs destroy the ozone layer?
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  2. #earth
  3. #gases
  4. #atmosphere
  5. #nitrous
  6. #rather
  7. #temperature
  8. #greenhouse
  9. #cause
  10. #oxide
  11. #carbon
  12. #dioxide
  13. #methane
  14. #effect
  15. #without
  16. #water
  17. #average
  18. #about
  19. #vapor
  20. #present
  21. #primary
  22. #surface
  23. #ozone