Regulators have drawn up tentative targets for greenhouse gas reductions for shipping.

The draft goals come after a week of tough negotiations at the IMO's greenhouse gases working group, where delegates have been under pressure to draw up a long-term plan ahead of adoption next spring.

But sources close to the IMO working group say despite the apparent consensus, there are still differences of opinion between member states, and that the targets were only agreed on the condition that they were negotiable.