The OP would argue that we know myopia is chiefly caused by childhood visual experience and that Hygiene Hypothesis may explain asthma, which is definitely exac

The OP would argue that we know myopia is chiefly caused by childhood visual experience and that Hygiene Hypothesis may explain asthma, which is definitely exacerbated by air pollution. IMHO, however, people who talk about how happy people are in subsistence and developing societies haven't actually spent much time in them.