https://en.wikipedia.org/wiki/Last_Glacial_Maximum
末次冰盛期（Last Glacial Maximum，LGM），又譯「末次巔冰期」，是指末次冰期中氣候最為寒冷、冰川規模達到最大的時期，距今約2.65至1.9～2萬年。在這一時期，末次冰期達到極盛，北歐大部、北美北部以及北亞的一部分均被大陸冰蓋覆蓋。
Soon after 20,000 BC global warming began. Initially this was rather slow and uneven - many small ups and downs of temperature and rainfall.
By 15,000 BC the great ice sheets had begun to melt; by 12,000 BC the climate had started to fluctuate, with dramatic surges of warmth and rain followed by sudden returns to cold and drought.
Soon after 10,000 BC there was an astonishing spurt of global warming that brought the ice age to its close and ushered in the Holocene world, that in which we live today. (After The Ice: A Global Human History 20,000-5000 BC, Steven Mithen, 2003, p. 20)
