Knowra World population World population World population is the total number of people alive on Earth at a given time. Its size is estimated from censuses, civil registration, and demographic models.
Demography : The statistical study of human populations, including their size, composition, and change. Its methods combine national data into estimates of the global total.
Population growth rate : The percentage change in a population over a specified period, resulting from births, deaths, and migration. It expresses how quickly the world total is changing.
Human population history : The study of changes in human population size and distribution from prehistory to the present. It places the modern total within a much longer, uneven history of growth.
Population density : The number of people living per unit of land area. It shows how unevenly the world total is distributed across territory.
United Nations population projections : Scenario-based estimates of future population published by the United Nations using demographic assumptions. Their ranges make uncertainty in the world population outlook explicit.
Fertility rate : A measure of births in a population, often expressed as births per woman over her lifetime. Births add people to the total and shape its future growth.
Age structure : The distribution of a population across age groups at a given time. Two populations of equal size can have very different future growth because of their age structures.
Neolithic Revolution : The shift in some societies from foraging to farming, beginning around 10,000 BCE. Agriculture supported denser settlements and contributed to long-term population expansion.
Urbanization : The increasing share of a population living in urban areas. It describes a major redistribution of people within the global total.
Population aging : An increase in the share of older people in a population, often associated with longer lives and lower fertility. Global aging may reshape the effects of a stable or growing total.
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