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The cause of the Medieval Warm Period is still uncertain, because not enough is yet known about it. In particular, it was formerly believed to have been a global warming period, but scientists now believe it was only a North Atlantic phenomenon. Although known as a "Warm Period", temperatures were not excessively higher than those that prevailed beforehand and were probably between 0.1°C and 0.2°C below the 1961 to 1990 mean as well as significantly below the level shown by instrumental data after 1980. When the extent and effect of the Medieval Warm Period are more fully known, scientists will be better placed to ascertain exactly what its cause was.

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"Michael Mann, the father of the now famous hockey stick graph and the concept of global warming in general, says that based on the analyses and modelling that he has done, increased solar output and a reduction in volcanoes spouting cooling ash into the atmosphere could have not only kicked off the medieval warming, but might also have maintained it directly."

While it is impossible to make a few tenths of s degree predictions as to the temperature of 1000 years ago, it is possible to determine that the temperatures of this period, globally, were similar to the temperatures of today.

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