The International Maritime Organisation (IMO) is tightening energy efficiency rules for boxships and gas carriers.

A draft of a new agreement drawn up last week shows that new containerships will now be required to be up to 50% more efficient by 2022, against the previous target of 30% by 2025, Reuters reported.

New general cargoships, LPG and LNG carriers and hybrid diesel-electric cruiseships will also have to be up to 30% more efficient by 2022.