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.
A team of researchers based their findings on data from 9,000 wooden artifacts from the past 2,500 years.
They found that periods of warm, wet summers coincided with prosperity, while political turmoil occurred during times of climate instability.
The findings have been published online by the journal Science.
"Looking back on 2,500 years, there are examples where climate change impacted human history," co-author Ulf Buntgen, a paleoclimatologist at the Swiss Federal Research Institute for Forest, Snow and Landscape, told the Science website.
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