More stringent air emission requirements for seagoing vessels are introducing a new challenge for maritime administrations and services. These challenges are all the more daunting in the IMO ECAs. One of the possible solutions to compliance is the use of LNG as propulsion fuel for shipping, next to the use of low sulfur fuels and the installation of exhaust gas scrubbers. According to data from engine manufacturer Rolls-Royce, relative emissions for these various compliance options clearly demonstrate LNG propulsion as the overall environmental winner.