For millennia, the human population grew very slowly, probably about 0.04 percent per year through the eighteenth century. Population growth accelerated in the nineteenth century due to advances in health care, nutrition, and public sanitation. By 1800, the population was about 1 billion people. The rate of population growth rapidly accelerated in the 20th century, reaching about 2 percent per
For millennia, the human population grew very slowly, probably about 0.04 percent per year through the eighteenth century. Population growth accelerated in the nineteenth century due to advances in health care, nutrition, and public sanitation. By 1800, the population was about 1 billion people. The rate of population growth rapidly accelerated in the 20th century, reaching about 2 percent per
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