> 
> https://e360.yale.edu/features/climate-clues-from-the-past-prompt-new-look-at-history
> 
> “ The study found that 62 of 68 dynastic collapses⁠ occurred soon after 
> Northern Hemisphere volcanic eruptions, an outcome that had only a 
> one-in-2,000 chance of happening if the eruptions and collapses were 
> unrelated. Chinese have traditionally cited the withdrawal of the “mandate of 
> heaven” to explain the cold weather, droughts, floods, and agricultural 
> failures that seemed to accompany the fall of dynasties. The paper contends 
> that those phenomena have a climatic explanation.”

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