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The gas furnace in my basement don't have a massive jet turbine emiting high frequency noise

It's the low frequencies that's more of an issue apparently. Benn Jordan has a great series of videos about it, including one on Colossus

I wouldn't call noise pollution a "tremendous externality". The gas turbines should just be placed far enough from where people live.

Should, but in fact are too close.

It's not a tremendous externality. It only affects a very small group that lives nearby.

A tremendous externality was leaded gas that was everywhere.