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File photo: An adult black bear walks through a residential neighborhood on September 9, 2012 in Montrose, California.
The earth's human population is over 7 billion and growing. As our numbers increase, we spread into areas where wild pigs, alligators, coyotes and countless other species live.
The line between wildlife habitat and human housing is becoming increasingly blurred, so how should we deal with bears digging through the neighborhood garbage cans? Or an alligator taking a dip in the pool?
For some answers, we turn now to David von Drehle, editor at large for Time Magazine, who wrote about this for the latest issue.