More people means more capacity to produce. Love them or hate them Japan, russia and china are showing the world how to manage (or how to not manage) demographic shifts. Places with money are taking steps to reduce massive overpopulation, places without it are still growing.
For decades we all assumed chinas vast population was their great weakness, not enough resources for everyone etc etc etc. As it turns out the most valuable resource is people, with energy (not electrical energy, more personal ability to work energy) and education, because everything else can be created from those two things. Not enough coal, uranium, oil etc? No problem, we'll invent something else. Too many people? No problem, we'll figure out how to make birth control.
Yes, it means more people, especially in africa, will probably starve to death. That's another problem we can solve if we bother to.
The biggest problem we face isn't 7 billion people, it's politicians who are unwilling or unable to make tough choices about how to deal with whatever specific challenges that creates in the long ru. I don't think anyone is really fond of chinas 1 child policy (or moreover its implementation), but the alternative is the mess that is india, where children are legally obliged to support parents, and there's no incentive, to have less children. Education and food production can catch up, or keep up, with the people we have, if we create reasonable incentives to limit family sizes and solve problems. And if governments aren't willing or able to make choices like that the people in those states are beyond anyones ability to meaningfully help in the long run anyway, so we'll try, and fail.
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