A coalition of environmental groups has voiced deep disappointment with the IMO's failure to move forward on mandatory speed limits last week.

The Clean Shipping Coalition, which is made up of green groups with consultative status at the IMO, said the treaty body showed a lack of progress and "low ambition".

"Two years after agreeing its initial GHG [greenhouse gas] strategy, a meeting of the UN maritime agency, the IMO, did little more than review options already on the table and gave far too much time to technical measures...