The pollution problem can be addressed through cleaner technology
The natural trend in terms of population growth is that rates of childbirth slow down significantly once a country is fully industrialized
The places where overpopulation is an actual serious problem are not yet at this stage. But IIRC the prediction is that global population will plateau around 9 billion or so, which in itself isn't an unsustainable number, assuming we can get the cleaner technology required to cut down in pollution and improve our farming methods to make them less damaging
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