If you like your Medieval Warm Period, you can keep your Medieval Warm Period – UN IPCC Rewrites Temperature History
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In the 1990 IPCC report, the Medieval Warm Period was much warmer than the late 19th century.
But in the 2001 IPCC report, the Medieval Warm period disappeared and became much cooler than the late 20th century.
By pure coincidence, in the year 1995 the IPCC made a decision to make the Medieval Warm Period disappear.