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Population growth rate (2023, our world in data) [1] absolute increase in global human population per year [2] population growth is the increase in the number of people in a population or dispersed group [5][6] for the time of speciation of homo sapiens, some 200,000 years ago, an effective population size of the order of. The global population has grown from 1 billion in 1800 to 8.2 billion in 2025
[3] actual global human population growth amounts to around 70 million annually, or 0.85% per year A late human population bottleneck is postulated by some scholars at approximately 70,000 years ago, during the toba catastrophe, when homo sapiens population may have dropped to as low as between 1,000 and 10,000 individuals World population high, medium, and low projections of the future human world population [1] in world demographics, the world population is the total number of humans currently alive
Demography is the statistical and mathematical study of the size, composition, and spatial distribution of human populations and how these features change over time
Data are obtained from a census of the population and from registries Records of events like birth, deaths, migrations, marriages, divorces, diseases, and employment. In human biology, a population can be defined as a set of people living in a particular area (a country, region, city, or the whole world), being increased or decreased in number over time [1][2] in biology, one of the definitions of a population is about interbreeding individuals, [2] and in genetics, a definition may involve a common gene pool
[3] in contrast to other animals, human mating. Earth has a human population of over 8.2 billion as of 2025, with an overall population density of 50 people per km 2 (130 per sq Nearly 60% of the world's population lives in asia, with more than 2.8 billion in the countries of india and china combined. Population dynamics is the type of mathematics used to model and study the size and age composition of populations as dynamical systems
Population dynamics is a branch of mathematical biology, and uses mathematical techniques such as differential equations to model behaviour.
Population geography is the study of the distribution, composition, migration, and growth of human populations in relation to the geographic characteristics of specific area It focuses on how populations are distributed across space, the factors influencing these distributions, and the implications for resources, environment, and societal development This branch of geography integrates.
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