Table of Contents
ExtinctZoo retells a dispute over a narrowed human gene pool. A 1972 paper put a crash somewhere in a span of 35 to 65 millennia ago, and many researchers in the 1990s blamed Indonesia’s Lake Toba eruption, about 74 millennia ago. People living near the volcano seem to have continued, and later climate models look milder. Quiet followed until a 2023 study of thousands of modern genomes argued for a much older collapse, about 800 to 900 millennia ago, in earlier humans rather than our own species. Survivors, the narration says, fell near 1,280, a nearly total loss that lasted past 117 millennia. The favored cause is a harsher glacial rhythm, especially a cold dry phase in Africa and Eurasia, worse if fire was still rare. Once fire spread, numbers are said to have jumped. Later work either pushes the crash past a million years or keeps the date and blames fatal migrations out of Africa. ExtinctZoo leaves the argument unfinished, and it is not a verdict on any people living now.
Key points
- An older theory tied a loss of human genetic variety to the Toba eruption about 74,000 years ago.
- ExtinctZoo says that volcano explanation is now widely doubted because nearby groups persisted and the dates miss.
- A 2023 genome study is presented as evidence of a far older crash, down to roughly 1,280 earlier humans.
- The channel links the losses to a colder, drier turn in the glacial cycle and to little control of fire.
- Later papers, as the video tells them, either move the crash further back or blame deadly exits from Africa.
Short quotes
Meaning that humanity saw the extinction of 98.7% of the entire population.
ExtinctZoo, A human bottleneck near 900,000 years ago
On the channel’s reading of the 2023 study, almost the whole ancestral population died. Watch at 2:23
This event was basically a major change in the glacial cycle that dominated Earth.
ExtinctZoo, A human bottleneck near 900,000 years ago
The proposed driver is a shift to longer and harsher ice ages, not a single volcano. Watch at 4:32
If true, it would prove that the 0.9 MA event was not the main culprit behind our ancestors near extinction.
ExtinctZoo, A human bottleneck near 900,000 years ago
A follow up team, as the video reports it, dates the crash to more than a million years ago. Watch at 7:44
Video by ExtinctZoo. Watch on YouTube.