1. 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

2. Recent warming in the context of past warming

3. 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)