the idea that languages adapt, probabilistically and likely over long periods, to the influence of dry air on the larynx.
low humidity values and low vowel indices is very strong, across languages (Figure 2) or language families (Figure 3)
The claim that there are more CV syllables in warm places is, practically speaking, very similar to the claim that vowel indices are higher in humid places
People in colder regions tend to be closer to their interlocutors during speech events, and so need not rely as much on vowels that are so sonorant.
vowel indices correlate positively with temperature, their association with humidity is more pronounced.
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