The growth of population has had profound effects on the social structure, economic development, and politics of most countries. It is a key variable in human development theory. A notable effect of population growth is that it has caused global life expectancy to greatly increase.
Population growth is the increase in the number of people in a population. Global human population growth amounts to around 83 million annually, or 1.1% per year.
The global population has grown from 1 billion in 1800 to 7.9 billion in 2020. The UN projected population to keep growing, and estimates have put the total population at 8.6 billion by mid-2030, 9.8 billion by mid-2050 and 11.2 billion by 2100.
However, some academics outside the UN have increasingly developed human population models that account for additional downward pressures on population growth; in such a scenario population would peak before 2100. A popular estimate of sustainable population is 8 billion people.
World human population has been growing since the end of the Black Death, around the year 1350. A mix of technological advancement that improved agricultural productivity and sanitation and medical advancement that reduced mortality have caused an exponential population growth.
In some geographies, this has slowed through the process called the demographic transition, where many nations with high standards of living have seen a significant slowing of population growth.
This is in direct contrast with less developed contexts, where population growth is still happening. However, the global human population is projected to peak during the mid-21st century and decline by 2100.
