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Great visualization.

IMO 2020 regulation unintentionally contributed to global warming while reducing air pollution. This rule drastically cut the amount of sulfur permitted in ship fuel, which improved public health but reduced the reflective effect of atmospheric aerosols that had been masking some global warming.

You'd think the people making the rules would try and look at all the impacts.

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The cooling effect of SO2 was certainly known when the IMO regulations were decided upon. It was decided that the public health advantages outweighed the climate warming. One can certainly quibble whether this decision was correct or not, but it wasn't done in ignorance.

(My take would have been be to allow high sulphur fuel out on the high seas, where there's very few humans around (or flora and fauna in general). )

Are you sure about that? I think it caught most people by surprise - and i assume the policymakers as well.

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