Is the rate of recent warming greater than observed in the past?

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Presentation transcript:

Is the rate of recent warming greater than observed in the past? Time 400,000 years of temperature records from ice cores Is the rate of recent warming greater than observed in the past? Difficult to determine from these graphs owing to the difference in the time scales (400,000 years vs 150 years) Time 150 years of temperature measurements

Recent warming in the context of past warming

Frequency distribution of warming and cooling rates over 400,000 year record Recent warming in the context of past warming (rate is in the 97% percentile of observed historical rates)