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Exponential Growth in Earth’s Population
Population grows in the same way that money grows, when it's left in a bank to compound interest.
With money, growth comes through accumulating interest upon interest.
The interest payments you accumulate eventually earn interest, increasing your money.
With population growth, new members of the population eventually produce other new members of
the population.
The population increases exponentially as time passes.
A crucial difference between money and population is that money can increase without limits,
while population can't.
Any population of living creatures is constrained by the availability of food, water, housing,
or other important resources.
WORLD POPULATION GROWTH
| Year | Population |
| 1 | 200 million |
| 1000 | 275 million |
| 1500 | 450 million |
| 1650 | 500 million |
| 1700 | 600 million |
| 1750 | 700 million |
| 1800 | 900 million |
| 1804 | 1.0 billion |
| 1850 | 1.2 billion |
| 1900 | 1.5 billion |
| 1927 | 2.0 billion |
| 1950 | 2.5 billion |
| 1955 | 2.8 billion |
| 1960 | 3.0 billion |
| 1965 | 3.3 billion |
| 1970 | 3.7 billion |
| 1975 | 4.0 billion |
| 1980 | 4.5 billion |
| 1985 | 4.8 billion |
| 1990 | 5.3 billion |
| 1995 | 5.7 billion |
| 2000 | 6.0 billion |
| 2005 | 6.4 billion |
| 2006 | 6.5 billion |
| 2008 | 6.6 billion |
| 2010 | 6.8 billion |
| 2020 | 7.6 billion |
| 2030 | 8.2 billion |
| 2040 | 8.8 billion |
| 2050 | 9.2 billion |
UNITED NATIONS POPULATION ESTIMATES
| Year | Population (in billions) |
| 1900 | 1.65 |
| 1910 | 1.75 |
| 1920 | 1.86 |
| 1930 | 2.07 |
| 1940 | 2.30 |
| 1950 | 2.52 |
| 1960 | 3.02 |
| 1970 | 3.70 |
| 1980 | 4.44 |
| 1990 | 5.27 |
| 2000 | 6.06 |
Source: United Nations Population Division
INDIVIDUAL NATIONS
UK — Population: 60,776,238 (July 2007 est.)
According to https://www.cia.gov/library/publications/the-world-factbook/print/uk.html
In the UK, population is officially projected to rise from 60.6 million (mid 2006) to
71 million in 2030 (another one and a half Londons) in barely two decades.
Source: United Nations Population Division, World Population Prospects, 13 March 2007
China — Population: 1,321,851,888 (July 2007 est.)
According to http://wikitravel.org/en/China
USA — Population: 301,139,947 (July 2007 est.)
According to https://www.cia.gov/library/publications/the-world-factbook/print/us.html
Component Settings For January 2008 For USA
| One birth every.......................................... | 8 seconds |
| One death every........................................ | 11 seconds |
| One international migrant (net) every.............. | 30 seconds |
| Net gain of one person every......................... | 13 seconds |
| Net gain every 24 hours ............................... | 6,500 people |
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