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What happens in an age of "peak human"

Hopping a ride in Jalandhar, India. Photo: Shammi Mehra / AFP / Getty

Earth will have almost 10 billion people by 2050, according to the United Nations, and yet another billion by the turn of the century, creating a substrate of tension under climate change, aging, and automation. But Vienna-based demographers say these forecasts overstate the population trend. Instead, they say, we are headed for a population plateau and decline — in short, "peak human."