Population Growth

Population growth is the change in a population over time, and can be quantified as the change in the number of individuals of any species in a population using "per unit time" for measurement. In biology, the term population growth is likely to refer to any known organism, but this article deals mostly with the application of the term to human populations in demography.

In demography, population growth is used informally for the more specific term population growth rate (see below), and is often used to refer specifically to the growth of the human population of the world.

Simple models of population growth include the Malthusian Growth Model and the logistic model.

Population growth 1800-2011: from 1 billion to 7 billion estimated in 31.10.2011. During the year 2011, according to estimates:

Population
Years Passed Year Billion
- 1800 1
127 1927 2
33 1960 3
14 1974 4
13 1987 5
12 1999 6
12 2011* 7
14 2025* 8
18 2043* 9
40 2083* 10
  • 135 million people were born
  • 57 million people died
  • 78 million people increased the world population.

Read more about Population Growth:  Determinants of Population Growth, Population Growth Rate, Excessive Growth and Decline, Human Population Growth Rate, Growth By Country, Into The Future

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Famous quotes containing the words growth and/or population:

    Every child has an inner timetable for growth—a pattern unique to him. . . . Growth is not steady, forward, upward progression. It is instead a switchback trail; three steps forward, two back, one around the bushes, and a few simply standing, before another forward leap.
    Dorothy Corkville Briggs (20th century)

    O for a man who is a man, and, as my neighbor says, has a bone in his back which you cannot pass your hand through! Our statistics are at fault: the population has been returned too large. How many men are there to a square thousand miles in this country? Hardly one.
    Henry David Thoreau (1817–1862)