I read somewhere that sulfur emissions from global shipping have been making the part of the world where such shipping is most active (i.e. around Europe, North

I read somewhere that sulfur emissions from global shipping have been making the part of the world where such shipping is most active (i.e. around Europe, North America and China) cooler than it otherwise would be. But now we're using low-sulfur fuels, so things might rapidly get worse in these latitudes.