A proposed amendment to the European Union’s monitoring, reporting and verification (MRV) scheme calls for a ban on emissions from ships in ports by 2030.

If adopted, the little-noticed move by the European Parliament would put “cold ironing” — whereby ships plug into electrical supplies at ports — back on the agenda for huge numbers of vessels. It would require the technology well beyond the few ferries, cruiseships and boxships that are currently fitted for it.