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45-542: The processes of population expansion and resettlement led to an exchange of cultures and cultural diversity of languages, traditions and lifestyles. The Landesausbau changed the natural and cultural landscapes of Western Europe and continues to have an impact. The terminology “inland colonization“ to describe the Landesausbau has raised controversies between historians because of the linguistic parallelism to modern colonialism . After an early phase of Landesausbau at

90-471: A few programs, most notably the Chinese government's one-child per family policy, have resorted to coercive measures. In the 1970s, tension grew between population control advocates and women's health activists who advanced women's reproductive rights as part of a human rights -based approach. Growing opposition to the narrow population control focus led to a significant change in population control policies in

135-663: A multitude of ethnic groups and, in most cases, peacefully on the initiative of landowners and landlords. The settlement east of Elbe and Saale at the 12th century involved mainly Germans , the so-called ″coloni Theutonici″, extending the German-speaking lands to beyond the Oder to Pomerania , Silesia , Bohemia , Moravia , East Prussia and West Prussia . However, the Landesausbau also involved Slavs , such as in Masurua , and Flemish , Danish and other ethnic groups. The Landesausbau

180-451: A sufficiently small time interval: A positive growth rate indicates that the population is increasing, while a negative growth rate indicates that the population is decreasing. A growth ratio of zero indicates that there were the same number of individuals at the beginning and end of the period—a growth rate may be zero even when there are significant changes in the birth rates , death rates , immigration rates , and age distribution between

225-575: Is a driver of environmental concerns , such as biodiversity loss and climate change , due to 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 which seeks to improve the standard of living globally while reducing the impact of society on the environment while advancing human well-being. World population has been rising continuously since

270-469: Is a separable differential equation, the population may be solved explicitly, producing a logistic function : where A = K − P 0 P 0 {\displaystyle A={\frac {K-P_{0}}{P_{0}}}} and P 0 {\displaystyle P_{0}} is the initial population at time 0. The world population growth rate peaked in 1963 at 2.2% per year and subsequently declined. In 2017,

315-913: Is also known therefore as a gamodeme. This also implies that all members belong to the same species. If the gamodeme is very large (theoretically, approaching infinity), and all gene alleles are uniformly distributed by the gametes within it, the gamodeme is said to be panmictic. Under this state, allele ( gamete ) frequencies can be converted to genotype ( zygote ) frequencies by expanding an appropriate quadratic equation , as shown by Sir Ronald Fisher in his establishment of quantitative genetics. This seldom occurs in nature: localization of gamete exchange – through dispersal limitations, preferential mating, cataclysm, or other cause – may lead to small actual gamodemes which exchange gametes reasonably uniformly within themselves but are virtually separated from their neighboring gamodemes. However, there may be low frequencies of exchange with these neighbors. This may be viewed as

360-528: Is derived from the Late Latin populatio (a people, a multitude), which itself is derived from the Latin word populus (a people). In sociology and population geography , population refers to a group of human beings with some predefined feature in common, such as location, race , ethnicity , nationality , or religion . In ecology , a population is a group of organisms of the same species which inhabit

405-600: Is not even known to the nearest million, so there is a considerable margin of error in such estimates. Researcher Carl Haub calculated that a total of over 100 billion people have probably been born in the last 2000 years. Population growth increased significantly as the Industrial Revolution gathered pace from 1700 onwards. The last 50 years have seen a yet more rapid increase in the rate of population growth due to medical advances and substantial increases in agricultural productivity, particularly beginning in

450-611: Is often referred to as the demographic transition . Human population planning is the practice of altering the rate of growth of a human population. Historically, human population control has been implemented with the goal of limiting the rate of population growth. In the period from the 1950s to the 1980s, concerns about global population growth and its effects on poverty, environmental degradation , and political stability led to efforts to reduce population growth rates. While population control can involve measures that improve people's lives by giving them greater control of their reproduction,

495-455: Is the increase in the number of people in a population or dispersed group. Actual 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 8.1 billion in 2024. 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

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540-402: Is the rate at which the number of individuals in a population increases in a given time period, expressed as a fraction of the initial population. Specifically, population growth rate refers to the change in population over a unit time period, often expressed as a percentage of the number of individuals in the population at the beginning of that period. This can be written as the formula, valid for

585-703: Is very likely that the world's population will stop growing before the end of the 21st century. Further, there is some likelihood that population will actually decline before 2100. Population has already declined in the last decade or two in Eastern Europe, the Baltics and in the former Commonwealth of Independent States. The population pattern of less-developed regions of the world in recent years has been marked by gradually declining birth rates. These followed an earlier sharp reduction in death rates. This transition from high birth and death rates to low birth and death rates

630-506: The DRC are witnessing a similar growth in population. The following table gives some example countries or territories: Human population projections are attempts to extrapolate how human populations will change in the future. These projections are an important input to forecasts of the population's impact on this planet and humanity's future well-being. Models of population growth take trends in human development and apply projections into

675-497: The population is declining , especially in Eastern Europe , mainly due to low fertility rates , high death rates and emigration . In Southern Africa , growth is slowing due to the high number of AIDS-related deaths. Some Western Europe countries might also experience population decline. Japan's population began decreasing in 2005. The United Nations Population Division projects world population to reach 11.2 billion by

720-547: The 1960s, made by the Green Revolution . In 2017 the United Nations Population Division projected that the world's population would reach about 9.8 billion in 2050 and 11.2 billion in 2100. In the future, the world's population is expected to peak at some point, after which it will decline due to economic reasons, health concerns, land exhaustion and environmental hazards. According to one report, it

765-898: The Eastern borders of the Holy Roman Empire to the Finnish Sea Bus, the Black Sea and the Sava , took place. At the same time, the Normans settled in England and Southern Italy and the Crusaders expanded to the Iberian Peninsula . During the intense phase of Landesausbau, the area that was settled and cultivated increased by a third. It must be emphasized that cultivation and settlement were carried out by

810-505: The German chemist Fritz Haber , served as the "detonator of the population explosion ", enabling the global population to increase from 1.6 billion in 1900 to 7.7 billion by November 2019. Some of the reasons for the "Modern Rise of Population" were particularly investigated by the British health scientist Thomas McKeown (1912–1988). In his publications, McKeown challenged four theories about

855-705: 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. The 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. In some geographies, this has slowed through

900-409: The UN projected that the world population, 8 billion as of 2023 , would peak around the year 2086 at about 10.4 billion, and then start a slow decline, assuming a continuing decrease in the global average fertility rate from 2.5 births per woman during the 2015–2020 period to 1.8 by the year 2100 (the medium-variant projection). The UN’s 2024 report has revised the peak population to 10.3 billion in

945-485: The United States Census Bureau, the world population hit 6.5 billion on 24 February 2006. The United Nations Population Fund designated 12 October 1999 as the approximate day on which world population reached 6 billion. This was about 12 years after the world population reached 5 billion in 1987, and six years after the world population reached 5.5 billion in 1993. The population of countries such as Nigeria

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990-480: The breaking up of a large sexual population (panmictic) into smaller overlapping sexual populations. This failure of panmixia leads to two important changes in overall population structure: (1) the component gamodemes vary (through gamete sampling) in their allele frequencies when compared with each other and with the theoretical panmictic original (this is known as dispersion, and its details can be estimated using expansion of an appropriate binomial equation ); and (2)

1035-463: The drainage of wetlands for the creation of new settlement and cultivation areas became necessary. The Landesausbau can also be seen in relation to the changing social pattern. The spread of a new money system in the 12th century, the birth of towns with market privileges, the creation of new distant trade routes to the Netherlands and Lombardy and intensive commercial relations all greatly increased

1080-527: The end of the Black Death , around the year 1350. Population began growing rapidly in the Western world during the industrial revolution . The most significant increase in the world's population has been since the 1950s, mainly due to medical advancements and increases in agricultural productivity . Due to its dramatic impact on the human ability to grow food, the Haber process , named after one of its inventors,

1125-522: The end of the 21st century. The Institute for Health Metrics and Evaluation projects that the global population will peak in 2064 at 9.73 billion and decline to 8.89 billion in 2100. A 2014 study in Science concludes that the global population will reach 11 billion by 2100, with a 70% chance of continued growth into the 22nd century. The German Foundation for World Population reported in December 2019 that

1170-629: The end of the 7th century, the land expansion and the establishment of new settlements increased from the 10th century onwards and reached its peak at the 12th century. It came to a halt at the 14th century because of natural catastrophes, the outbreak of the Black Plague and other crises that caused a steep decline in population. As part of the Landesausbau in High Middle Ages, the Eastern Settlement of peasants, craftsmen and merchants crossing

1215-419: The estimated annual growth rate was 1.1%. The CIA World Factbook gives the world annual birthrate, mortality rate, and growth rate as 1.86%, 0.78%, and 1.08% respectively. The last 100 years have seen a massive fourfold increase in the population, due to medical advances , lower mortality rates, and an increase in agricultural productivity made possible by the Green Revolution . The annual increase in

1260-531: The future. These models use trend-based-assumptions about how populations will respond to economic, social and technological forces to understand how they will affect fertility and mortality , and thus population growth. The 2022 projections from the United Nations Population Division (chart #1) show that annual world population growth peaked at 2.3% per year in 1963, has since dropped to 0.9% in 2023, equivalent to about 74 million people each year, and could drop even further to minus 0.1% by 2100. Based on this,

1305-561: The global human population grows by 2.6 people every second, and could reach 8 billion by 2023. According to United Nations population statistics, the world population grew by 30%, or 1.6 billion humans, between 1990 and 2010. In number of people the increase was highest in India (350 million) and China (196 million). Population growth rate was among highest in the United Arab Emirates (315%) and Qatar (271%). Many of

1350-515: The global population will continue to grow, although at a steadily slower rate, until the mid 2080s (the median line). Population Population is the term typically used to refer to the number of people in a single area. Governments conduct a census to quantify the size of a resident population within a given jurisdiction. The term is also applied to non-human animals , microorganisms , and plants , and has specific uses within such fields as ecology and genetics . The word population

1395-463: The level of homozygosity rises in the entire collection of gamodemes. The overall rise in homozygosity is quantified by the inbreeding coefficient (f or φ). All homozygotes are increased in frequency – both the deleterious and the desirable. The mean phenotype of the gamodemes collection is lower than that of the panmictic original – which is known as inbreeding depression. It is most important to note, however, that some dispersion lines will be superior to

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1440-494: The mobility of merchants and craftmen. The merchants and craftmen were attracted by privileges such as free trade and the heritable, interest-free ownership of their enclosed domiciles in urban centres. At the same time, feudalistic structures were weakened and so the bonds of serfdom that tied peasants to the land diminished. The greater mobility contributed to the resettlement of the population, especially during High Middle Ages. Population growth Population growth

1485-671: The number of living humans peaked at 88.0 million in 1989, then slowly declined to 73.9 million in 2003, after which it rose again to 75.2 million in 2006. In 2017, the human population increased by 83 million. Generally, developed nations have seen a decline in their growth rates in recent decades, though annual growth rates remain above 2% in some countries of the Middle East and Sub-Saharan Africa , and also in South Asia , Southeast Asia , and Latin America . In some countries

1530-418: The panmictic original, while some will be about the same, and some will be inferior. The probabilities of each can be estimated from those binomial equations. In plant and animal breeding , procedures have been developed which deliberately utilize the effects of dispersion (such as line breeding, pure-line breeding, backcrossing). Dispersion-assisted selection leads to the greatest genetic advance (ΔG=change in

1575-711: The phenotypic mean), and is much more powerful than selection acting without attendant dispersion. This is so for both allogamous (random fertilization) and autogamous (self-fertilization) gamodemes. According to the UN, the world's population surpassed 8 billion on 15 November 2022, an increase of 1 billion since 12 March 2012. According to a separate estimate by the United Nations, Earth's population exceeded seven billion in October 2011. According to UNFPA , growth to such an extent offers unprecedented challenges and opportunities to all of humanity. According to papers published by

1620-566: The population growth: Although the McKeown thesis has been heavily disputed, recent studies have confirmed the value of his ideas. His work is pivotal for present day thinking about population growth, birth control, public health and medical care. McKeown had a major influence on many population researchers, such as health economists and Nobel prize winners Robert W. Fogel (1993) and Angus Deaton (2015). The latter considered McKeown as "the founder of social medicine ". The "population growth rate"

1665-439: The population has reached its carrying capacity , it will stabilize and the exponential curve will level off towards the carrying capacity, which is usually when a population has depleted most its natural resources . In the world human population, growth may be said to have been following a linear trend throughout the last few decades. The growth of a population can often be modelled by the logistic equation where As it

1710-466: The population of a certain species in a certain area can be estimated using the Lincoln index to calculate the total population of an area based on the number of individuals observed. In genetics, a population is often defined as a set of organisms in which any pair of members can breed together. They can thus routinely exchange gametes in order to have usually fertile progeny, and such a breeding group

1755-399: 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. Globally, the rate of population growth has declined from a peak of 2.2% per year in 1963. Population growth alongside increased consumption

1800-410: The same geographical area and are capable of interbreeding . The area of a sexual population is the area where interbreeding is possible between any opposite-sex pair within the area and more probable than cross-breeding with individuals from other areas. In humans , interbreeding is unrestricted by racial differences, as all humans belong to the same species of Homo sapiens. In ecology,

1845-474: The supply of the population with food. The population of Europe increased significantly at the High Middle Ages , but an extensive, almost deserted fallow land of forests and marshes was not cleared. Around 1300, the population of Europe is estimated to have reached a peak of as high as 70 million, and the population density reached a peak of over 20 inhabitants per square kilometre. The clearing of woods and

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1890-411: The two times. A related measure is the net reproduction rate . In the absence of migration, a net reproduction rate of more than 1 indicates that the population of females is increasing, while a net reproduction rate less than one ( sub-replacement fertility ) indicates that the population of females is decreasing. Most populations do not grow exponentially, rather they follow a logistic model . Once

1935-680: The world's countries, including many in Sub-Saharan Africa , the Middle East , South Asia and South East Asia , have seen a sharp rise in population since the end of the Cold War . The fear is that high population numbers are putting further strain on natural resources, food supplies, fuel supplies, employment, housing, etc. in some of the less fortunate countries. For example, the population of Chad has ultimately grown from 6,279,921 in 1993 to 10,329,208 in 2009, further straining its resources. Vietnam , Mexico , Nigeria , Egypt , Ethiopia , and

1980-515: The year 2084. However, estimates outside of the United Nations have put forward alternative models based on additional downward pressure on fertility (such as successful implementation of education and family planning goals in the UN's Sustainable Development Goals ) which could result in peak population during the 2060–2070 period rather than later. Even though the global fertility rate continues to fall, chart #2 shows that because of population momentum

2025-610: Was caused by several factors, including a moderate climate known as the Medieval Warm Period from about 950 to 1250, which resulted in a greater exploitation of the natural resources and in longer and more productive growing season. At the same time, technological breakthroughs such as better harnessing material, including whippletrees , traces and dykes and mills went parallel with improved cultivation techniques, including selective cropping and grazing as well as crop rotation (the so-called three-field-rotation). They improved

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