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Increased carbon levels are found in ice deposits from the period of the Roman Empire. There's nothing prior to that.

• empath75 7y ago
  There’s no ice that goes back a hundred million years.
  • zaroth 7y ago
    I think 2 million years is about as far as we can go... https://www.nature.com/articles/s41586-019-1692-3 https://www.nature.com/articles/s41586-019-1692-3
• akyu 7y ago
  Fake news