>>20437241
>personally, i would be surprised if the human species makes it another 100 years
Bottlenecks, Anon. Made us who we are:
Results showed that human ancestors went through a severe population bottleneck with about 1280 breeding individuals between around 930,000 and 813,000 years ago. The bottleneck lasted for about 117,000 years and brought human ancestors close to extinction.
https://www.science.org/doi/10.1126/science.abq7487
Populations that did not experience a bottleneck in their demographic history avoided extinction entirely, while more than 20% of populations that experienced an intermediate or strong bottleneck went extinct.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10445088/
Around 70,000 years ago, humanity's global population dropped down to only a few thousand individuals, and it had major effects on our species.
https://www.businessinsider.com/genetic-bottleneck-almost-killed-humans-2016-3
No evidence contradicts the contention that one of these bottlenecks took place at the time of the speciation at the beginning of our lineage, at the end of the Pliocene some 2 MYA. This early population size bottleneck has great explanatory power and important implications for understanding genetic variation and its relationship with past population size.
https://academic.oup.com/mbe/article/17/1/2/975516