YouTube: https://youtube.com/watch?v=yWtPeHIPHmA
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Duration:04:01
Uploaded:2018-07-10
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In which John gets curious about the last time global human population declined and ends up learning about a period of human history called The General Crisis.
Thanks to Our World in Data for being such an amazing source of information about life on Earth: https://ourworldindata.org/ And thanks to Hannah Ritchie for answering my question!

Learn more about the general crisis: https://en.wikipedia.org/wiki/The_General_Crisis

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