How many humans have ever been born on Earth?



As of May 2024, the world population is over

8.11 billion and is projected to reach 9.7 billion by 2050, but this is only the number of people currently living on Earth. The US Demographic Research Board (PRB) estimates the number of people born since the birth of the Earth, not the number of people currently living on Earth.

How Many People Have Ever Lived? - YouTube


How Many People Have Ever Lived on Earth? | PRB
https://www.prb.org/articles/how-many-people-have-ever-lived-on-earth/



The PRB estimates the total number of people who have ever lived by combining the period of time humans are thought to have been on Earth, the average population at different times, and

birth rates , which indicate the number of births per 1,000 people.

However, it is not easy to determine when humans first appeared, and the PRB defines the birth of humans as 'around 190,000 BC, when Homo sapiens is believed to have been born.'

The table below shows the trends in the world's population as estimated by the PRB, based on information from the United Nations and other sources.
Year Total population (people) Birth rate (per mille) Number of births during this period Number of people born so far Percentage of births (%)
190,000 B.C. 2 80 - - -
50,000 B.C. 2000000 80 7,856,100,000 7,856,100,000 2 0
8000 B.C. 5 million 80 1,137,789,769 8,993,889,771 0.1
1 A.D. 300 million 80 46,025,332,354 55,019,222,125 0.5
1200 450 million 60 26,591,343,400 81,610,565,125 0.6
1650 500 million 60 12,782,002,453 94,392,567,578 0.5
1750 795 million 50 3,171,931,513 97,564,499,091 0.8
1850 1,265 million 40 4,046,249,000 101,610,739,100 1.2
1900 1,656 million 40 2,923,785,600 104,510,976,956 1.6
1950 2,499 million 31～38 3,390,298,215 107,911,751,710 2.3
the year of 2000 6,149 million twenty two 6,064,994,884 11,396,617,550 5.4
2010 6,986 million 20 1,364,003,405 115,330,173,460 6.1
2022 7,963,400,000 17 1,690,275,115 117,020,448,575 6.8
2035 8,899 million 16 1,758,578,889 118,779,027,464 7.5
2050 9,752 million 14 2,068,409,608 120,847,437,072 8.1


The population growth rate from 8000 BC to 1 AD was very low at only 0.05%, and the PRB analyzed that 'the population during this period is likely to have fluctuated significantly due to changes in food availability, livestock breeding conditions, friendly relations with foreign countries, and climatic conditions.' In addition, while the average life expectancy until around 100 AD was in the teens, the human species inevitably had a high birth rate in order to survive, and the birth rate during this period was 80 per mille, much higher than the modern birth rate.

By 1650, the world's population had reached about 500 million, not a huge increase from the estimated population of about 300 million in 1 AD. The PRB cites the plague as the reason for this. Since then, the world's population has grown rapidly as the mortality rate has decreased with advances in public health, medicine, and nutrition. By 1800, the world's population had topped 1 billion, and is expected to reach 8 billion in 2022.



'Little is known about population sizes between 190,000 BC and 1 AD, and understanding the population during this period is key to refining our estimates,' the PRB said.

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in Science, Posted by log1r_ut