“Climate fraudsters frequently claim that the 1990 IPCC temperature graph below showing the Medieval Warm Period (MWP) was only a representation of Central England Temperatures (CET) and was not global.”
This is nonsense. The graph was derived from James Hansen’s 1981 study, which was taken from temperatures in England, California and Greenland.
(b) is based on temperatures in central England, the tree limit in the White Mountains of California, and oxygen isotope measurements in the Greenland ice (W. Dansgaard of the Geophysical Isotope Laboratory, University of Copenhagen, pers. comm.), with the temperature scale set by the variations in the last 100 years
The overlay below shows that the 1990 IPCC graph is essentially the same graph as Hansen 1981.
The MWP was real.
‘More than 700 scientists from 400 institutions in 40 countries have contributed peer-reviewed papers providing evidence that the Medieval Warm Period was real, global, & warmer than the present’ – Climate Depot’s Medieval Warm Period Round Up of Studies
Check out latest MWP map here.
Roman and Medieval Warm Periods vs. the Current Warm Period – Studies ‘clearly demonstrating that there has been nothing unusual or unprecedented about the mean level of global warmth experienced over the past 18 years of no significant upward or downward trend.’
New Paper: Evidence of a Medieval Warm Period in Antarctica -‘We here review the findings of several studies that have found evidence for the Medieval Warm Period in a region that is as far away from lands bordering on the North Atlantic Ocean as one could possibly get, i.e., Antarctica’
The Medieval Warm Period was global & explains the Current Warm Period — Evidence of a Medieval Warm Period in Antarctica – ‘Review of the findings of several studies that have found evidence for the Medieval Warm Period in a region that is as far away from lands bordering on the North Atlantic Ocean as one could possibly get, i.e., Antarctica’