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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