Study Reveals How Ancient Humans Escaped Climate Extinction 900,000 Years Ago

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, modern humanity's ancestors were reduced to a breeding population of barely 1,300 individuals in a devastating bottleneck that brought us to the very brink of annihilation. Now, a new study has found that a mass migration of humans out of Africa occurred at the same time.

The movement of early humans into and across Europe and Asia from Africa is difficult to reconstruct. The best evidence we have consists of a sparse record of bones and mostly stone artifacts, which can beTwo recent studies have linked human migration to a population bottleneck, based on different types of analysis.

They compared their findings to marine sediment records, which preserve evidence of changes in the climate in the form of oxygen isotopes. Ratios of oxygen trapped in sediment layers indicate whether the climate was warmer or cooler at the time the minerals were deposited.

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