Recently, some scientists have studied the impact of climate change on human society in history  They found that more than 80% of the world's countries and regions had twice as many wars in cold climates as in warm periods; in China, wars, widespread unrest and dynasty replacement over the past 1000 years mostly corresponded to particularly long cold periods; there was a close link between Europe's Little Ice Age from 1550 to 1850 and witch hunts in European history and even the French Revolution
In 2003, due to the warming of the Indian Ocean affecting monsoon activities, precipitation in the Darfur region of Sudan fell sharply, causing severe shortages of food and water resources, and then triggering armed conflicts
 As a result, they concluded that cooling climate will lead to social conflicts and dynasty replacement