Climate Change 2001:
The Scientific Basis
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Figure 14: Global mean surface air temperature anomalies from 1,000 year control simulations with three different climate models, Hadley, Geophysical Fluid Dynamics Laboratory and Hamburg, compared to the recent instrumental record. No model control simulation shows a trend in surface air temperature as large as the observed trend. If internal variability is correct in these models, the recent warming is likely not due to variability produced within the climate system alone. [Based on Figure 12.1]

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