DNV and LLoyds recently finished a report on the effects of the new IMO regulations for CO2 emissions, the Energy Efficiency Design Index (EEDI) and the Ship Energy Efficiency Management Plan (SEEMP). It is clearly shown that in the high growth scenario, with high uptake of the regulations, emissions from shipping will roughly double by 2050:
The increased demand of international transport easily compensates any efficiency improvement. Much further work is thus needed. As a reference, the European Commission goal for shipping in 2050 is a 40-50% reduction, as can be found in the 2011 Transport White Paper.