I think you could make a very good argument that there are already too many people now.
Population doesn’t grown in a nice straight line – it goes up and up and up at an ever increasing rate. What it means is that if you are over 30, you are already older than 50% of the population of the world, even though most people now live to over 80! That’s a big proportion of young people, and it’ll be about the same when they get to 30!
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