The nonprofit Carbon War Room has rated the greenhouse gas efficiency of nearly every big oceangoing vessel in the world, which will be searchable in a new data hub designed to help ship owners, operators, ports and stakeholders make better, more efficient shipping decisions...[U]sers can access the efficiency rating of nearly all of the world's container ships, tankers, bulk carriers, cargo ships and cruise ships...The ratings...[use] a methodology from the United Nations International Maritime Organization called the Energy Efficiency Design Index...According to the group, shippers will be able to use the information to select more efficient vessels..., which will hopefully incentivizee ship owners to invest in fleet efficiency...[P]orts can use the data to offer incentives to cleaner vessels..."The Carbon War Room has been advocating the need for business to play a leading role in the fight to reduce carbon emissions," said Sir Richard Branson, co-founder of the Carbon War Room...