I'm concerned about some worrying trends. So far we've been ok for the last 40 years, but right now there are some very large and very important countries which are declining in population even after taking immigration into account, and more on the way.
The ones I can think of are Russia, Japan and China.
Russia's in a basketcase league of its own. China has the one child policy which, given the level of development they currently have, will almost certainly increase human welfare for the next generation, though the method used to achieve it is repugnant. Japan could probably live with a much higher birthrate.
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