A quick history lesson about a recent ice age.
The Late Antique Little Ice Age (LALIA) was a long-lasting Northern Hemisphere cooling period lasting from 536 to about 660 AD.[1]This period followed three immense volcanic eruptions in 536, 540 and 547.
https://en.wikipedia.org/wiki/Late_Antique_Little_Ice_Age
Late Antique Little Ice Age linked to the plague and fall of empires
“In AD 536, the first of three massive volcanic eruptions ushered in a mini ice age,” writes Penny Sarchet inNew Scientist. “It coincided with an epidemic of the plague, the decline of the eastern Roman Empire, and sweeping upheavals across Eurasia.”
“It wasn’t just the Romans who suffered,” says Sarchet. “The eastern Türk empire around modern-day Mongolia and the Northern Wei and Sui dynasties in China also fell during this time.”
Via Robert