I recently read this interesting book, The Fate of Rome, Climate, Disease, and the End of an Empire by Kyle Harper: https://press.princeton.edu/titles/11079.html. Historically, most analyses of the fall of the Roman Empire rely on corruption, the breakdown of collegiality and bad governance, barbarian invasions and many other such factors. Harper’s thesis is that climate change, old, new and emerging diseases, and the expansion of the Empire contributing and reacting to the