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Humanity has fire, which is a necessity to survive an ice age. They have simple stone tools and weapons.
They face fierce predators. This is the golden age for very large mammals: mammoths, sabertooth tigers, mastodons, and many others. The large size may have protected them from the cold.
Fast forward 70,000 years. Between 130,000 and 110,000 there is an inter-glacial period. The ice sheets recede. The climate approaches what it is like in historic times.
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Pictured is a Homo Erectus, the most primitive of the 3 groups of humans. Source: Wikipedia.
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