The world's population

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Population explosion means a very rapid rise in the number of people in the world, especially in the twentieth century. The world population grew slowly for centuries, then increased sharply after 185…

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By 1650 the world population had doubled since AD 1 to about 500 million. By 1850 it had reached 1.2 billion. In 1927 it reached 2 billion. By 2000 it had passed 6 billion. At the end of 2011 it reach…

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The average annual growth rate was 0.6% in 1850-1900, 0.9% in the next 50 years, and 1.9% a year after 1960. This shows how sharply population growth accelerated in the twentieth century.

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In 1994 the world population increased by 95 million, which was the biggest single-year increase so far. In 1995 it increased by 100 million to 5750 million.

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An increase of 2% per year means that a population doubles in about 30 years. This is a useful rule for understanding how quickly a population can grow when the birth rate stays high.

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Several causes worked together: industrialization created jobs and wealth, public health improved because of medical science and sanitation, infant mortality fell, and immigration increased the popula…

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Immigration greatly increased the population of the USA. In the 100 years after 1820, about 35 million people entered the USA. In the last few years before 1914, immigrants were arriving at the rate o…

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Population growth slowed mainly because more people used modern contraceptive methods. Later, the economic depression of the 1930s also discouraged people from having many children.