Time for a Pollyanna around here...
You need to look past the headline number and look at the demographics. Look at the female fertility over time in all areas of the world. It's fallen off a cliff. But it doesn't show in the big picture number for 50 years for ageing to reduce the population.
Besides, genius is statistical. You get 1000 times as many geniuses with 8 billions versus 8 million...
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