I always felt that the earth was getting too crowded and hoped we could slow growth at least. I feel 10 billion could be a comfortable number but we may pass that before this century is out. I think 1 child may be harsh for certain areas of the planet that already are experiencing birth rate declines like Europe and North America. Maybe base it off the existing population per land area or GDP per capita something like that. If you have room for more people and you can feed and employ more people you can have more people.
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I agree, the birth restriction ultimately needs to be done so that it matches what earth can handle. If earth can handle it then its ok to have x amount of children. Yea if a country's pop. is falling then the 1 child rule wouldn't apply to them, unless their pop. is still more than the land can bear. Tbh seeing how our soil is already getting depleted and sea life is being wiped out to fill our bellies we're well over the point where there's just too many people on the earth. All in all it would be a tricky thing to implement without inadvertently discriminating against other regions of people.