claim: The original global temperature schematic which appeared in the IPCC First Assessment Report and seemed to show the Medieval Warm Period ( MWP ) hotter than Present was based on the central England temperature record, and ended in the 1950s.
evidence: The IPCC First Assessment Report included a schematic diagram of global temperature variations over the last thousand years which has been traced to a graph based loosely on Hubert Lamb's 1965 paper.