Bunker fuel is nasty. Burning it produces prodigious quantities of H2S, which is deadly at levels below 100 PPM.
Requiring shipping companies to use cleaner fuels such as diesel or LNG, all of a sudden the costs to ship goods from China to the US helps level the playing field without tariffs. Win - win.
Let the Enviros help us for a change!
Why are tariffs a bad thing? Better than the income tax. What’s the aversion to tariff in the USA? THE REST OFF THE WORLD USES/HAS THEM.
Let the Enviros help us for a change!
Good luck enforcing that in international waters. Ships could be "dual-fuel" capable, though - just switch tanks to the cleaner stuff as you approach coastal areas.