Earth’s entire human population was once 18,500!

Earth’s human population is currently a little over 6,900,000,000 people, that’s nealry 7 billion people!

Scientists have calculated that for a period lasting one million years and beginning 1.2 million years ago, at a time when our ancestors were spreading through Africa, Europe and Asia, there were probably between 18,500 to 26,000 individuals capable of breeding (and no more than 26,000). This made them an endangered species with a smaller population than today’s species such as gorillas, which number 25,000 breeding individuals, and chimpanzees (21,000).

Researchers have proposed a number of explanations , such as events in which a significant proportion of the population is killed or prevented from reproducing. One such event was the Toba super-volcano in Indonesia that erupted around 70,000 years ago, triggering a nuclear winter. Only an estimated 15,000 humans are thought to have survived. Read more here.

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2 Responses to “Earth’s entire human population was once 18,500!”

  1. illuminavi Says:

    Don’t think you posted enough 000’s, as 6,900,000 is just almost 7 million, not billion hehe. That is a heck of a lot of people though!

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