Comment by simonsarris

5 hours ago

Younger Dryas, definitely. It very likely abruptly stopped progress in human agriculture, before allowing it to abruptly restart again. Makes the Medieval warm period and little ice age look like a joke. Two massive shifts that punctuate the timeline of early human prehistory.

> The Younger Dryas (YD, Greenland Stadial GS-1) was a period in Earth's geologic history that occurred circa 12,900 to 11,700 years Before Present (BP). It is primarily known for the sudden or "abrupt" cooling in the Northern Hemisphere, when the North Atlantic Ocean cooled and annual air temperatures decreased by ~3 °C (5 °F) over North America, 2–6 °C (4–11 °F) in Europe and up to 10 °C (18 °F) in Greenland, in a few decades