human population

The world population is the total number of humans on Earth at a given time. In September 2007, the world's population is believed to have reached over 6.6 billion. In line with population projections, this figure continues to grow at rates that were unprecedented before the 20th century, although the rate of increase has almost halved since its peak, which was reached in 1963, of 2.2 percent per year. The world's population is expected to reach over 9 billion by the year 2050.
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