This post is by Brigid Fitzgerald Reading, staff researcher at the Earth Policy Institute. The number of people in the world is expected to reach 7 billion by the end of October 2011. Our rate of increase continues to slow from the high point of over 2 percent in 1968. Still, this year’s 1.1 percent increase means some 78 million people will be added to the global population in 2011. The human population did not reach 1 billion until the early nineteenth century, and it took more than 100 years to reach 2 billion. After that, the intervals between billions …
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