IDTechEx sees green fuels, such as green hydrogen and ammonia, as some of the most promising solutions, with the new IDTechEx report “Fuel Cell Boats & Ships 2023-2033: PEMFC, SOFC, Hydrogen, Ammonia, LNG” predicting that green hydrogen PEMFC (proton exchange membrane fuel cell) and LNG/green ammonia SOFC (solid-oxide fuel cell) markets will grow rapidly at 35% CAGR over a ten-year period.