https://westhunt.wordpress.com/2013/05/09/sustainability/
1. Sub-replacement birth-rate in high-IQ nations
2. Dysgenic fertility pattern in high-IQ nations
3. Historically unprecedented continuous accumulation of mutational load throughout the population in high-IQ nations
=Civilizational collapse if left uncorrected
Cochran's corrective to apocalypticism:
"Again, I don’t believe a word of it [referring to a commenter's claim that average English IQ levels have dropped 15 points (1 std dev) in the last 120 years]. As for the declining rate of innovation, you have to have a really wide-ranging understanding of modern science and technology to have any feeling for what the underlying causes are. I come closer than most, and I probably don’t know enough. You don’t know enough. Let me tell you one thing: if genetic potential IQ for IQ had dropped 1 std, we’d see the end of progress in higher mathematics, and that has not happened at all.
Moreover, the selective trends disfavoring IQ all involve higher education among women and apparently nothing else – a trend which didn’t really get started until much more recently.
Not long enough, nor is dysgenic selection strong enough."
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