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Population growth
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Side-by-side line graphs compare exponential and logistic population growth. The exponential growth graph shows a curve rising steeply upward, while the logistic growth graph shows an S-shaped curve leveling off at the carrying capacity of the environment. Line graph showing cyclical rises and falls in snowshoe hare and lynx populations from 1855 to 1925, with hare numbers peaking before lynx numbers, illustrating predator-prey dynamics. Snowy forest background and a legend with animal illustrations identify each species. A multi-line chart titled “Fertility rates through the decades” shows fertility trends by global region from 1950 to 2050, with years on the horizontal axis and fertility rates from 1 to 7 on the vertical axis. Each region is represented by a colored line: Africa in light brown remains the highest throughout, peaking above 6 in the 1960s before steadily declining toward 3 by 2050. Asia in light gray begins above 5, declines sharply after 1970, and falls just above 2 by 2050. Central and South America in dark gray follow a similar decline from around 5 to below 2. Europe in dark gray-purple starts near 2.7, falls below the replacement line in the 1970s, and remains near 1.5. North America in light teal declines from around 3.5 to about 1.8. Oceania in dark blue peaks near 4 in the 1960s and declines to about 2. A red line for the world average trends downward from about 5 to below 2. A black dashed horizontal line marks the replacement rate at roughly 2.1. The area from 2024 to 2050 is shaded to indicate projected. global warming scenarios
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Population growth: Media

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Figure 1: Exponential versus logistic population growth
Graphs representing exponential population growth (left) and logistic population...
Encyclopædia Britannica, Inc.
Figure 2: Hare and lynx populations over time
Cyclical fluctuations in the population density of the snowshoe hare and its effect...
Encyclopædia Britannica, Inc. Photo: © vik898–iStock/Getty Images
global warming scenarios
Graph of the predicted increase in Earth's average surface temperature according...
Encyclopædia Britannica, Inc.

Interactives

Global fertility rate decline: Trends from 1950 to 2050
This chart illustrates fertility rates across major world regions from 1950 to 2050,...
Encyclopædia Britannica, Inc.
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