Population doesn't have to grow at all, but billions of people living without all the amenities found in "western" civilization will sooner or later all achieve a similar standard we hold today. Cars, houses, AC, heat, lights, pumps, pavement, highways, etc, etc. Just like we live better than our ancestors 100 years ago, they will too. The more it happens, the less likely large scale war is as well. People with something to lose are more peaceful than people with nothing to lose.
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