Varsovian: LIttle ice age - sorry - wikipedia will inform you when it was, I won't waste my time. What does wiki say
There is no agreed beginning year to the Little Ice Age, although there is a frequently referenced series of events preceding the known climatic minima. Starting in the 13th century, pack ice began advancing southwards in the North Atlantic, as did glaciers in Greenland. The three years of torrential rains beginning in 1315 ushered in an era of unpredictable weather in Northern Europe which did not lift until the 19th century. There is anecdotal evidence of expanding glaciers almost worldwide. In contrast, a climate reconstruction based on glacial length[7][8] shows no great variation from 1600 to 1850, though it shows strong retreat thereafter.
For this reason, any of several dates ranging over 400 years may indicate the beginning of the Little Ice Age:
1250 for when Atlantic pack ice began to grow 1300 for when warm summers stopped being dependable in Northern Europe 1315 for the rains and Great Famine of 1315-1317 1550 for theorized beginning of worldwide glacial expansion 1650 for the first climatic minimum. Hmmmmm not sure
so another site
The Little Ice Age (or LIA) refers to a period between 1350 and 1900 when temperatures in the Northern Hemisphere were between 1.0 and 2.0°C cooler than at present. From The National Climatic Data Center In the US The same organisation has also started to archive global tree ring data, you can browse.
You said "Extreme political events will happen EITHER: (a) immediately after an unexpected one-off event OR (ii) shortly after the lowest point of a long trend is reached." This is clearly nonsense and is not backed by historical sources.
You dont like the word superstition lets use the term anecdotal evidence instead. Of course famine causes unrest as does changes in taxation or land use to give two examples. Do all other upheavals that occurred within a period of climatic stasis count, If not is it because they dont fit the description?
History doesnt have to be like science and trying to make it so betrays an agenda.
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