Molson Hart

By the way, there used to be a Wikipedia page on Cold Winters Theory but that has now been memory-holed. (@KirkegaardEmil do you know what happened?)

Unfortunately, the study does NOT take into account the effect of migrations from temperate to tropical countries (e.g. European migrations to the New World or mainland Chinese migrations to Singapore and Taiwan). If it had, the relationship would be even stronger.

The authors are professors at the University of French Polynesia, so I guess they have some personal experience of these matters.

What about continuously cold environments like the inuits and northern siberians? Some possible counter-examples to the study: 1. Native Tasmanians 2. Native Argentines 3. Inca civilization

Yeah there are some outliers. 1 likely recently descended from more tropical people.