![]() ![]() Historical and archeological evidence can reveal how societies have responded to climate variability in the past. This evidence shows that both regions experienced overall medieval warming and Little Ice Age cooling, but because of their paucity and sometimes poor data quality, it is very difficult to know from these sources alone if the medieval period was as warm as, or warmer than, the late 20th and early 21st centuries. 1700 the evidence thins out and often becomes discontinuous.Įurope and East Asia are the two regions of the world where temperature series more than 200 years long have been successfully developed from documentary evidence in a repeatable and consistent way. Historical observations and documents provide valuable, seasonally specific information about past temperatures and other features of climate, but prior to about A.D. ![]()
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