Steve,
The last glaciation ended a mere ten thousand or so years ago. Before that, hunting, gathering and scavenging were the only means of subsistence for all species of Homo, including Homo sapiens

Glaciation only affected the temperate regions.

Before that, hunting, gathering and scavenging were the only means of subsistence for all species of Homo, including Homo sapiens.

Except for the majority of them, because they inhabited tropical regions!