ClassNK issued an Approval in Principle (AiP) for an ammonia-fueled gas carrier which has been jointly developed by Mitsui O.S.K. Lines, Tsuneishi Shipbuilding and Mitsui E&S Shipbuilding.Ammonia is expected to be used as a ship fuel for decarbonization since it does not emit CO2 when combusted.
https://www.marinelink.com/news/japanese-leaders-collaborate-504380