60 SECOND HISTORY: How Earth's population exploded from 6 million to 8 billion.

Enami TV: The planet's population was sparse also partly because hunter-gatherers needed a lot of land to feed themselves -- around 10 square kilometers per person, according to Herve Le Bras, a researcher at the French Institute for Demographic Studies (INED).
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Information in this report sourced from: https://news.abs-cbn.com/spotlight/11/08/22/how-earths-population-exploded.