[Ans] How many humans are estimated to have ever lived on Earth?

Step 1 : Introduction to the question "How many humans are estimated to have ever lived on Earth?"

There are more people on Earth today than ever before – about 8 billion, which represent 7% of the estimated 117 billion people who have ever lived throughout human history. The estimate comes from the Population Reference Bureau, whose calculations are based on three primary variables: the estimated length of time humans have walked the Earth, the average population over different eras, and the number of births per 1,000 people during such eras. There were an estimated 5 million humans on earth in 8000 B.CE, 300 million in 1 C.E., 450 million in 1200, and 1.65 billion in 1900.

Step 2 : Answer to the question "How many humans are estimated to have ever lived on Earth?"

117 billion:

There are more people on Earth today than ever before – about 8 billion, which represent 7% of the estimated 117 billion people who have ever lived throughout human history. The estimate comes from the Population Reference Bureau, whose calculations are based on three primary variables: the estimated length of time humans have walked the Earth, the average population over different eras, and the number of births per 1,000 people during such eras. There were an estimated 5 million humans on earth in 8000 B.CE, 300 million in 1 C.E., 450 million in 1200, and 1.65 billion in 1900.

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