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An extensive study of tree growth rings says there could be a link between the rise and fall of past civilisations and sudden shifts in Europe's climate.
...They found that periods of warm, wet summers coincided with prosperity, while political turmoil occurred during times of climate instability.
"Wet and warm summers occurred during periods of Roman and medieval prosperity. Increased climate variability from 250-600 AD coincided with the demise of the western Roman empire and the turmoil of the migration period," the team reported.
"Distinct drying in the 3rd Century paralleled a period of serious crisis in the western Roman empire marked by barbarian invasion, political turmoil and economic dislocation in several provinces of Gaul."
Originally posted by HunkaHunka
Thing is, they didn't have telecommuting in the roman age... All sorts of economical differences between then and now which very well might make climate a lot less of an indicator at that order of magnitude.