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> the shipping industry right now uses the absolute worst, most polluting terrible fuels they can find as soon as they're in international waters

This was the case before 2020, but I think it has now been addressed by IMO 2020.

It is still used exactly as much as it was before, and sadly won’t change as a result of IMO for quite some time.

If it's still used just as much, then why are atmospheric SOx levels falling, especially over the oceans? [1]

I'm not saying there's 100% adherence, but you're saying this isn't related at all?