IPCC TAR WG1 (2001) summary, “Figure 5: Millennial Northern Hemisphere (NH) temperature reconstruction (blue – tree rings, corals, ice cores, and historical records) and instrumental data (red) from AD 1000 to 1999. Smoother version of NH series (black), and two standard error limits (gray shaded) are shown. [Based on Figure 2.20]”. Adapted from the MBH99 graph which Jerry Mahlman nicknamed the “hockey stick”.

October 26, 2011

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