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It took all of human history to reach 1 billion people in 1804 but little more than 150 years to reach 3 billion in 1960. It took only 12 years from 1987 to 1999 to add the sixth billion. Some pertinent questions to ask are: What changes have allowed humans to become such a dominant species on Earth? If the number of humans tripled during the 20th century, will it do so again in the 21st century? If it does, can Earth sustain the entire world population or will we overshoot the environment's c

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