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This seems to imply that for humans, any change that occurs at timescales beyond human lifetimes (and maybe shorter) is essentially unnoticeable. If we grow up in a context, that context defines normal. Shifting baselines, writ large at the species level. No? Only changes that take place during our lifetimes, after we have formed our brain's "context" will be considered abnormal by our brains (or, it seems, by our medical professionals). And those will only be thought of as abnormal relative to our personal contexts, not to any context that previously existed.

The implications of this, in terms of the possibility of humans responding wisely to the many long-term challenges that present themselves, is remarkably depressing.

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