 Major population reduction
Steve wrote, in his 'blog post: Brian says that sometime 300-600 years from now, we supposedly undergo a period of massive change, including major population reduction. But it’s unclear whether this happens due to war, disease, natural disaster, or simply a reduction in the birth rate.
Steve forgot a popular sci-fi option: people move elsewhere, through space colonisation. What sort of a Heinlein fan forgets...
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