70,000 BC: Evidence suggests a human population bottleneck and a population of only between 1,000 and 10,000 people, caused by a global volcanic winter of six to ten years.
After humans changed from hunter-gatherer lifestyle to agriculture, the world population started to increase steadily and doubled approximately every 1000 years until 1000 BC. (Children were probably economic liabilities in hunter-gatherer societies and this might have led to infanticide).
1 AD: The world population was approximately 300 million people.
541–549 AD: The plague of Justinian killed perhaps a 100 million people. This was about half the world's population at that time. The plague spread across Asia, North Africa, Arabia, and Europe.
1200s CE: Mongol campaigns resulted in the probable deaths of 40 million people, approximately 11.1% of the total world population.
1650 CE: The world's population was at 500 million.
1800 CE: The world's population over 1 billion.
1939-1945: Deaths directly caused by World WarII (including military and civilian fatalities) are estimated at 50–56 million, with an additional estimated 19–28 million deaths from war-related disease and famine.
Around 108 billion people have ever lived on our planet.
1950: 2.5 billion people.
1975: 4 billion people.
Between 1950 and 1987, world population doubled from 2.5 to 5 billion people.
2007: 6.6 billion people on Earth.
2020: 7.2 billion people.
2022: 7.9 billion on Earth.
2. India (1.39 billion)
3. United States (333 million)
4. Indonesia (276 million)
5. Pakistan (220 million)
6. Brazil (214 million)7. Nigeria (206 million)
8. Bangladesh (172 million)
9. Russia (146 million)
10. Mexico (127 million)