Italian refiner Saras is constructing a ship-refueling terminal at its Sardinia plant and will market a new, cleaner marine fuel ahead of a major regulatory change in 2020, its chief executive told Reuters.From January 2020, the International Maritime Organization (IMO) will ban ships from using fuels with a sulphur content above 0.5 percent, compared with 3.5 percent now, in one of the biggest changes in the oil market in decades.Refineries around the world have been gearing up for the switch by reducing output of high-sulphur fuel and upgrading plants to maximize production of the cleaner…