After the Last Glacial Maximum, solar radiation at high latitudes remains weak. The expected warming fails to materialise, and the Laurentide and Scandinavian ice sheets retain their mass.
The moment when, in the actual timeline, the Holocene began comes and goes without any thawing. The ice caps remain in place, sea levels stay low, and the Bering land bridge remains passable, dry land.
Without the fertile, warm conditions of a Holocene, grain agriculture such as that in the Fertile Crescent does not emerge. For centuries, people remain hunters, fishers, and gatherers on a large scale.
Despite the ongoing ice age climate, mammoths, woolly rhinoceroses, and cave lions still disappear, this time mainly due to human hunting pressure on a shrinking but still extensive habitat.
Human civilizations develop along the broad, exposed continental shelves rather than around flooded river plains. Trade networks follow the coastlines of a world with a much lower sea level.
In the present, people still live in a glacial era. Civilizations have adapted to permafrost and short growing seasons, with technology focused on warmth, storage, and survival in the cold rather than on expansion into warmer, uninhabited continents.
Where the original timeline predicts a new future ice age fifty thousand years from now, this world at that point still finds itself in the same unbroken glacial period that began at the Last Glacial Maximum.
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People, who had already spread across almost the entire globe, continue to live in a world of cold steppes and vast coastal plains that elsewhere would long since have been submerged. Groups of hunter-gatherers in North America and Siberia travel back and forth across the broad, grassy Bering land bridge, which is never flooded. There is no warm, moist transition that makes large-scale agriculture possible.