Most of the global population growth is in the developing nations especially in Africa. That's why the 'First World' nations need to get their act together and focus on developing the 'Third World' countries in order to encourage their population growth rates to drop.
Population estimates for 2050 show the total world population dropping. And that's a moderate projection, not the low one.
We do not have a population explosion to contend with, very soon, we will have just the opposite problem, economies desperate for more workers.
As for problems of overconsumption, there are two ways of dealing with this.
1. Have everybody reduce consumption,
2. Try to expand the pie.
I think 2 would be a much more palatable option, to expand the pie, so that there will be enough for everyone.
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