At the time of the Cognitive Revolution, the planet was home to about 200 genera of large terrestrial mammals… — Yuval Noah Harari
At the time of the Cognitive Revolution, the planet was home to about 200 genera of large terrestrial mammals weighing over fifty kilograms. At the time of the Agricultural Revolution, only about one hundred remained. Homo sapiens drove to extinction about half of the planet's big beasts long before humans invented the wheel, writing or iron tools.
Source: Wikiquote · CC BY-SA 4.0
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