Source: Debt: The First 5,000 Years (2011), Chapter Nine, "The Axial Age", p. 224
“The Maunder minimum corresponds almost precisely with the coldest excursion of the 'little ice age', a period of unusual cold in Europe from the 16th century through the early 19th century. In the coldest extremes of that period the average temperature was about one degree Celsius colder than it is now, according to the British climatologist Hubert H. Lamb. In that period the Alpine glaciers advanced farther than they had since the last major glaciation 15,000 years ago. In that period too the Norse colony in southwestern Greenland perished to a man, cut off from the rest of the world by pack ice that year after year failed to thaw.”
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                                John A. Eddy 12
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