Shipowners have begun ordering ships that are set up, at least theoretically, to be easier to move to burning ammonia at some point in the future.

But with so little clarity about which alternative fuels will work best — or when they or the engines to burn them will be readily available — what exactly are they getting?

Last month, tanker owner Euronav said it is working with shipbuilder Hyundai Samho Heavy Industries on a design to make recently ordered LNG-ready VLCCs also prepared for ammonia as a fuel.