Study traces ancient human population bottleneck to climate change

Ancestors of modern humans nearly went extinct about 930,000 years ago, with under 1,300 breeding individuals left.
The population crash was likely caused by climate change at the time.
After over 100,000 years, the population rebounded and continued evolving.
The bottleneck may explain the split between Neanderthals and modern humans.
Researchers reconstructed human history by studying 3,154 genomes from around the world.