Shippingefficiency.org records about 60,000 international vessels based on the United Nations' International Marine Organization’s (IMO) Energy Efficiency design Index (EEDI) & Clean Cargo Working Group (CCWG) index.
It’s a highly informative site to let each logistics parties know their greenhouse emission when producing goods & making business decision.
Take the world largest shipping vessel, Emma Maersk, as an example, it has EEDI grade C rating (A is the best; G is the worst) & CCWG grade A rating.