In 1981, NASA’s James Hansen showed a Medieval Warm Period – based on temperatures in Greenland, California and England.
In 1981, NASA’s
Global temperature trend 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 1990 IPCC report showed the same thing.
Overlaying Hansen’s 1981 graph on the 1990 IPCC graph, it can be seen that they are almost identical.
This research was reported in Nature in 1975.
24 May 1975, Page 12 – Ames Daily Tribune
The Medieval Warm Period has been known for over 80 years.
January 22, 1934 – NYTimes.com
The existence of the Medieval Warm Period wrecked the global warming scam, so professional climate fraudsters like Michael E Mann decided to get rid of it.
U.S. Senate Committee on Environment and Public Works
And by 2001, the Medieval Warm Period had been officially erased by the fraudsters known as “climate scientists.”
I’m from the County of Kent, England, and learned as a child that the climate there was much warmer than in recent decades. Indeed, Kent produced good wine and fruit that weren’t being produced in the post WW2 period. A quick check in Wikipedia check confirms that “The Roman Warm Period, or Roman Climatic Optimum” around 250 BC to AD 400.