IPCC participant Jay Overpeck said in his email to Professor Deming, “We have to get rid of the Medieval Warm Period.”
They have done just that, and renamed it the Medieval Climate Anomaly
New paleoclimate reconstruction efforts since AR4 (Figure 5.7; Table 5.4; Table 5.A.1) have provided further insights into the characteristics of the Medieval Climate Anomaly (MCA; Table 5.1)
almost all reconstructions agree that each 30-year (50-year) period from 1200 to 1899 was very likely colder in the NH than the 1983–2012 (1963–2012) instrumental temperature.
Apparently the Earth has warmed more than five degrees since 1973, using Hansen’s tampered UHI infected data.
In 1990, the IPCC knew nothing about this amazing five degree warming. Somehow the entire IPCC organization had missed the fastest warming in the history of the earth, until Mikey Mann discovered it a decade later.
Even Time Magazine used to know that there was an MWP
In the heyday of the Vikings, before 1300 A.D., the populous republic of Iceland lived largely by agriculture; the Norse raised sheep in Greenland, where no sheep graze today. After 1300, the cold crept down and the Icelanders gave up farming. The Greenlanders were exterminated, perhaps by starvation, perhaps by glacier-fleeing Eskimos. Now that the tide has turned, Dr. Ahlmann, a good Norseman, hopes the warm cycle will last for at least a few centuries.
Another possibility is that the IPCC is a criminal organization pretending to do science in order to push political objectives.