This is what the UN IPCC and other Warmist scientists used to say, before that became inconvenient. Via The Hockey Schtick, which provides this excerpt from the beginning of the study
Between the 10th and 14th centuries AD, earth’s average global temperature may have been warmer than it is today, according to the analyses of Lamb (1977, 1984, 1988) and Grove (1988). The existence of this Medieval Warm Period was initially deduced from historical weather records and proxy climate data from England and Northern Europe. Interestingly, the warmer conditions associated with this interval of time are also known to have had a largely beneficial impact on earth’s plant and animal life. In fact, the environmental conditions of this time period have been determined to have been so favorable that it was often referred to as the Little Climatic Optimum (Imbrie and Imbrie, 1979; Dean, 1994; Petersen, 1994; Serre-Bachet, 1994; Villalba, 1994)
At the end of the day, then, it would indeed appear that the peak warmth of the global Medieval Warm Period clearly exceeded that of the global Current Warm Period.
There is lots of information, bring lots and lots of studies together. We find out things like China being around 1.0C higher in temperature, the tree lines where higher and tree rings bigger in North America, suggesting higher temps. “Other data document vast glacial retreats during the MWP in parts of South America, Scandinavia, New Zealand and Alaska (Grove and Switsur, 1994; Villalba, 1994); and ocean-bed cores suggest that global sea surface temperatures were warmer then as well (Keigwin, 1996a, 1996b).” I hate pulling quotes from PDF’s, since they require massive reformatting, so I suggest you read it all. Just 23 pages long. I will pull two more, though.
In the area of human enterprise, the climatic conditions of the MWP proved providential. The Arctic ice pack, for example, substantially retreated, allowing the settlement of both Iceland and Greenland; while alpine passes normally blocked with snow and ice became traversable, opening trade routes between Italy and Germany (Crowley and North, 1991). Contemporaneously, on the northern Colorado Plate au in America, the Anasazi Indian civilization reached its climax, as warmer temperatures and better soil moisture conditions allowed them to farm a region twice as large as is presently possible (MacCracken et al ., 1990).
Huh.
In further discussing their findings, Perry and Hsu commented that “current global warming commonly is attributed to increased CO2 concentrations in the atmosphere.” However, as they continued, “geophysical, archaeological, and historical evidence is consistent with warming and cooling periods during the Holocene as indicated by the solar-output model.” And they thus concluded that the idea of “the modern temperature increase being caused solely by an increase in CO2 concentrations appears questionable.”
Of course, nothing will dissuade our Warmist brethren from their Beliefs, because this is a political issue for them, not a scientific one.
