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c17eleventhag - EleventhCentury about7501215:the"...

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Agricultural Revolution of the Eleventh Century
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Little Climatic Optimum The northern hemisphere became warmer from about 750 1215: the "little climatic optimum". This was followed by a cold spell to about 1350, and another cold spell from about 1550 1850 ("little ice age"). Proof can be seen in the Fernau glacier in the Tyrol, altitudinal limits of crops, and in tree rings, which all demonstrate that the climate was drier and, on average, about one to two degrees warmer. Even the Norse colonization of Iceland and Greenland have to be seen in this context.
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Population Growth After about 1000, Europe's population increased dramatically: About 27 million in 700; 40 million in 1000; 50 million by 1150; 61 million by 1200; 73 million by 1300.
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Population (continued) Much of the evidence is indirect: conquest of England, crusades, extensive colonization of lands. Land that had been deserted during the Viking age was later reclaimed during the eleventh century; also new lands cleared east of the Elbe.
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