The website at https://historyfacts.com asked and answered the question "What Was Earth’s Population Through History?"
They talk about the idea that "while it took most of human history for the population to reach 1 billion, it took only a little more than 200 additional years to hit 8 billion."
But what interested me most was that when looking back at prehistoric times, historians believe that only around 55,000 early humans walked the Earth some 1.2 million years ago.
By the end of the last Ice Age, about 20,000 years ago, the population had risen to about 1 million members of Homo sapiens.
Over the next 15,000 years, as human societies improved, the population increased more rapidly. By 5000 BCE, the world population was at least 5 million, and some estimates go as high as 20 million. But even that much higher number is still less than the present-day populations of cities such as São Paulo, Shanghai, and Tokyo.
ADDITIONAL
academic.oup.com/book/404/chapter-abstract/135207981
census.gov/data/tables/time-series/demo/international-programs/historical-est-worldpop.html
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