Two sweeping visions of the future have been unfolding, each producing grim — yet seemingly contradictory — predictions for the fate of humanity.   On the one hand, we’re learning that the birth rate is falling all over the world, leading to aging societies and a global population set to decline this century. If trends continue on their present path, demographers warn, there won’t be enough people to work to support society. The extreme labor shortages would lead to stagnation, poverty, and ultimately — in the most dire scenarios — the collapse of civilization itself. On the other h...

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