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    • Question

      What is the historical comparison period for the current

      CO₂  levels, as mentioned by WMO?
      A 1-2 million years ago Correct Answer Incorrect Answer
      B 2-3 million years ago Correct Answer Incorrect Answer
      C 3-5 million years ago Correct Answer Incorrect Answer
      D 5-6 million years ago Correct Answer Incorrect Answer
      E 6-8 million years ago Correct Answer Incorrect Answer

      Solution

      According to the WMO, current CO₂  levels were last seen 3-5 million years ago, when temperatures were 2-3°C warmer and sea levels were significantly higher.

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