The subject of population -- like sex, politics, and religion -- elicits such strong opinions that people often go out of their way to avoid talking about it. That's led many to believe that population growth is no longer a valid concern, but if you're worried about people, posterity, or the planet, it's time to talk. On Oct. 31, world population will cross the 7 billion mark. There's nothing particularly significant about that number. It's just a milestone, but it's also an opportunity for reflection and recalibration. A lot has happened since world population crossed the 6 billion mark in …
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Robert J. Walker is the executive vice president of the Population Institute.
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