claim: by the 2001 [ IPCC ] climate assessment...the Medieval Warm Period had been ingeniously wiped out.
evidence: The IPCC Third Assessment Report from 2001 then summarized research : evidence does not support globally synchronous periods of anomalous cold or warmth over this time frame, and the conventional terms of 'Little Ice Age' and 'Medieval Warm Period' appear to have limited utility in describing trends in hemispheric or global mean temperature changes in past centuries.