Ship owners worry about clean fuel bill as ports ban 'scrubbers'.

More ports around the world are banning ships from using a fuel cleaning system that pumps waste water into the sea, one of the cheapest options for meeting new environmental shipping rules.

The growing number of destinations imposing stricter regulations than those set by the International Maritime Organization (IMO) are expected to be a costly headache for cruise and shipping firms as they face tough market conditions and slowing world trade. They might have to pay for...