I am not a fan of todays diesels, but I would still say it is a tradeoff. Climate change is an awful threat, and diesels are about 25 % better in that perspective.
In California though, I agree with the diesel ban. The preconditions there are special, with air that does not move enough and lots of sun, causing extreme levels of smog.
I would guess that diesel engines can be as clean as gasoline engines in a couple of years, and the ban can then be removed.
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