Human Population History

 

Based on a few assumptions (modern h. sapiens sapiens start date 200,000 BCE, the Toba bottleneck reducing the population to 5000 individuals, average historical (before 1900) life expectancy at birth being 28 years), I worked up a few numbers.

By my calculations, 48.8 billion people have walked or are walking the Earth.  7 billion of them are around right now.  But how many people were alive to experience various and sundry events?

The following chart will show you.

(click for a bigger version)

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