Notes * Eritrea left Ethiopia in 1991. † Split into the nations of Sudan and South Sudan during 2011. ‡ Japan and the Ryukyu Islands merged in 1972. # India and Sikkim merged in 1975. Population growth 1990–2012 (%) [98] Cazenave, A. & Cozannet, G. L. Sea level rise and its coastal impacts. Earth’s Future 2, 15–34 (2014). Smil, Vaclav (1999). "Detonator of the population explosion" (PDF). Nature. 400 (6743): 415. Bibcode: 1999Natur.400..415S. doi: 10.1038/22672. S2CID 4301828. Newmark, PA; Sánchez Alvarado, A (2002). "Not your father's planarian: a classic model enters the era of functional genomics". Nat Rev Genet. 3 (3): 210–219. doi: 10.1038/nrg759. PMID 11972158. S2CID 28379017. The most recent 2022 revision of the UN's World Population Prospects report [20] represents a departure from the pattern of the previous ten years and expects that a slowing of the population growth rate will lead to a population peak of 10.4 billion in the 2080s, after which it would then begin to slowly fall. This shift from earlier projections of peak population and predicted date of zero population growth comes from a more rapid drop in Africa’s birth rate than previous projections had expected. [21] For example, the 2012 report predicted that the population of Nigeria, Africa’s most populous country, would rise to 914 million by 2100; the 2022 report lowers that to 546 million, a reduction of 368 million. [16] [6] [21] Jose Rimon of Johns Hopkins University suggested, "We have been underestimating what is happening in terms of fertility change in Africa. Africa will probably undergo the same kind of rapid changes as east Asia did." [21] Drivers of population change [ edit ]

Costanza, R. et al. Changes in the global value of ecosystem services. Glob. Environ. Change 26, 152–158 (2014). Jason Collins (January 2019). "The heritability of fertility makes world population stabilization unlikely in the foreseeable future". Evolution and Human Behavior. 40 (1): 105–111. doi: 10.1016/j.evolhumbehav.2018.09.001. S2CID 149854505.

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Growing at a slower pace, world population is expected to reach 9.7 billion in 2050 and could peak at nearly 11 billion around 2100". United Nations Department of Economic and Social Affairs. June 17, 2019. Thorne, K. et al. U.S. Pacific coastal wetland resilience and vulnerability to sea-level rise. Sci. Adv. 4, eaao3270 (2018). What is 2100 Divided by 4 Using Long Division?". VisualFractions.com. Accessed on November 28, 2023. http://visualfractions.com/calculator/long-division/what-is-2100-divided-by-4-using-long-division/.

a b c Roser, Max; Ritchie, Hannah; Ortiz-Ospina, Esteban (2013-05-09). "World Population Growth". Our World in Data. Estimated population of Canada, 1605 to present". Statistics Canada. 6 July 2009 . Retrieved 2011-04-17.a b "World Population Prospects, Standard Projections, Archive, 2012 Revision, Total Population Both Sexes file". United Nations Department of Economic and Social Affairs, Population Division. 2012.