Actually you casually mentioned republicans and "denial of weather ""science"" as kind of an aside to your worry about population. There is no population control for exactly the reasons mentioned by others, (greed etc) yet many of those reproduction centers ARE the first places that will be awash as the polar icecaps do what the do - melt. That will cut the population quite a bit and perhaps things will rebalance... however I think the humans are more likely to be wiped much much sooner by their technology and its failure.
Jim
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.