Deep emission cuts for shipping will be impossible without the introduction of carbon-free fuels, the president of Europe's shipping lobby warned on Monday.

Incremental technology progress, such as improving propellers or making engines more efficient, will not suffice to cut emissions by 50% from 2008 levels by the year 2050, as recently agreed at IMO level, said Panos Laskaridis, president of the European Community Shipowners' Associations (ECSA).