The MGTO was a a period of climatic history occurring from roughly 700-1300 AD. According to the Intergovernmental Panel on Climate Change (IPCC), temperatures during this period (especially in the North Atlantic) were higher than they are today. This period was followed by the LIA from roughly (1560-1830) in which climate temperatures were lower than they are today. Sunspot activity/data has correlated with the LIA which has posed questions as to the validity of greenhouse effects on recent temperature/climate changes.
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