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Medieval Warm Period
The Medieval Warm Period (MWP) or Medieval Climate Optimum was a time of unusually warm climate in the North Atlantic region. It lasted from about the tenth century to about the fourteenth century. In discussions of global warming this period is often mentioned.
- Bradley, Raymond S. Climate System Research Center. "Climate of the Last Millennium." 2003. February 23, 2007. 
- M.K. Hughes and H.F. Diaz, "Was there a 'Medieval Warm Period?", Climatic Change 26: 109-142, March 1994