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The world had 256 million inhabitants.
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At the year 1200 the world had 384 million inhabitants.
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After the Black Death epidemic in the 14th century, which killed thousands of people, the world's population slowly recovered.
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In 1650, there were 516 million inhabitants.
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The Industrial Revolution, which began in the 18th Century and developed significantly during the middle of the 19th Century, was a great force for change behind the growth and transformation of human society. As the birth rate increased and the mortality rate decreased, the world's population started to grow at a faster rate.
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In 1750 before the Industrial Revolution the world had 791 million inhabitants.
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There were 890 million people.
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There were 1.2 billion inhabitants. The population doubled within 100 years.
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There were 2.5 billion people in the world (even though the world population experienced two World Wars that caused many deaths and widespread destruction, and the world epidemics such as the 1918-1920 flu epidemic).
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The rate at wich the population grew rapidly accelerated and reached 6 billion people in 2000. Although the rowth has recently not been so fast, the population exceeded 7.3 billion in 2015 and it is predicted to be over 8 billion in 2025