And that's because shipping has very tight margins, and they want cheap fuel, so they use something called bunker fuel, which was described to me by someone in the tanker industry as the dregs of the refinery, or just one step up from asphalt.
Transport morski ma niewielkie marże i chce taniego paliwa, więc używają tak zwanego  paliwa żeglugowego, które osoba z branży opisała jako fusy z rafinerii, niewiele lepsze od asfaltu.