"The global human population growth amounts to around 83 million annually, or 1.1% per year."
The change in population size over time, due to births, deaths, immigration, and emigration.
Birth rate: The number of live births per 1,000 individuals in a population per year.
Death rate: The number of deaths per 1,000 individuals in a population per year.
Fertility rate: The average number of children born to a woman over her lifetime.
Mortality rate: The ratio of deaths in a particular population to the size of that population.
Life expectancy: The average number of years an individual is expected to live in a given population.
Age structure: The distribution of age groups in a population.
Demographic transition: A model describing changes in population growth rates, from high birth and death rates to low birth and death rates, as a country develops from a pre-industrial to an industrialized society.
Migration: The movement of individuals from one population to another.
Urbanization: The growth of cities and towns, usually as a result of migration from rural areas to urban centers.
Overpopulation: The condition where the number of people in a population exceeds the carrying capacity of the environment.
Replacement level fertility: The fertility rate necessary for a population to replace itself without migration.
Population growth models: Mathematical models that describe how populations grow and change over time.
Population genetics: The study of how genetic variations occur and are transmitted within and between populations.
Demographic factors: Social and cultural-economic factors such as education, income, and religion that influence population growth rates.
Population policies: Government policies and programs designed to address population growth, including family planning programs and immigration policies.
Exponential Growth: This type of population growth occurs when the growth rate of a population is proportional to its current size, resulting in a J-shaped curve. It is characterized by a constant growth rate over time, and is often seen in populations with few limiting factors.
Logistic Growth: This type of population growth occurs when a population grows rapidly in the beginning but slows down as it reaches its carrying capacity, resulting in an S-shaped curve. It is characterized by a maximum sustainable growth rate that is determined by the availability of resources in the environment.
Declining Growth: This type of population growth occurs when a population decreases in size over time. It can result from several factors such as natural disasters, disease outbreaks, human activities, environmental degradation, or changes in resource availability.
Negative Growth: This type of population growth occurs when the death rate of a population is higher than its birth rate, resulting in a decrease in population size.
Linear Growth: This type of population growth occurs when the growth rate of a population is constant over time, resulting in a straight-line graph. It is characterized by a steady increase in population size over time.
Overshoot and Dieback: This type of population growth occurs when a population grows beyond its carrying capacity, resulting in a sudden decline in population size. It is characterized by an initial period of rapid growth, followed by a period of rapid decline.
Malthusian Growth: This type of population growth occurs when a population grows faster than the availability of resources, resulting in famine, disease, wars, and other forms of human suffering. It is named after Thomas Malthus, who predicted that population growth would eventually outstrip food production.
Demographic Transition: This type of population growth occurs when a population undergoes a shift from high birth and death rates to low birth and death rates as a result of social and economic changes. It is characterized by an initial period of high population growth, followed by a gradual decline to a stable population size.
"The global population has grown from 1 billion in 1800 to 7.9 billion in 2020."
"The UN projected population to be 8.6 billion by mid-2030, 9.8 billion by mid-2050, and 11.2 billion by 2100."
"In such a scenario, population would peak before 2100."
"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. Others have challenged many recent population projections as having underestimated population growth."
"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 increased population growth."
"The demographic transition is a process where many nations with high standards of living have seen a significant slowing of population growth."
"In less-developed contexts, population growth is still happening."
"The rate of population growth has declined from a peak of 2.2% per year in 1963."
"The global human population is projected to peak during the mid-21st century."
"Population growth alongside increased consumption is a driver of environmental concerns, such as biodiversity loss and climate change."
"Overexploitation of natural resources for human development."
"International policy focused on mitigating the impact of human population growth is concentrated in the Sustainable Development Goals."
"The Sustainable Development Goals seek to improve the standard of living globally while reducing the impact of society on the environment while advancing human well-being."
"Technological advancement that improved agricultural productivity increased population growth."
"Medical advancement that reduced mortality increased population growth."
"Many nations with high standards of living have seen a significant slowing of population growth through the process called the demographic transition."
"Biodiversity loss and climate change due to overexploitation of natural resources for human development."
"The total population is projected to reach 11.2 billion by 2100."