Climate Change, War and Population Decline in Human History

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* Article: Global climate change, war, and population decline in recent human history. By David D. Zhang , Peter Brecke, et al. PNAS, December 2007

URL = https://www.pnas.org/doi/10.1073/pnas.0703073104

"We show that long-term fluctuations of war frequency and population changes followed the cycles of temperature change."


Description

"Although scientists have warned of possible social perils resulting from climate change, the impacts of long-term climate change on social unrest and population collapse have not been quantitatively investigated. In this study, high-resolution paleo-climatic data have been used to explore at a macroscale the effects of climate change on the outbreak of war and population decline in the preindustrial era. We show that long-term fluctuations of war frequency and population changes followed the cycles of temperature change."

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