When did 400 ppm Last co2?

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Related questions

  1. Why co2 is dangerous?
  2. Why is my carbon dioxide high?
  3. What happens if co2 levels are too low?
  4. Why is the carbon monoxide detector beeping?
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  6. Is drinking carbon dioxide bad for you?
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Tags

  1. #recently
  2. #years
  3. #atmosphere
  4. #concentration
  5. #million
  6. #enough
  7. #planet
  8. #during
  9. #pliocene
  10. #different
  11. #today
  12. #radically