Green hydrogen is an ideal transport fuel with great potential, which can play a key role in the decarbonization of the transportation sector. Compared with traditional fossil fuels, green hydrogen produces only water when burned, without any harmful gas emissions, which is very beneficial to environmental protection. In the field of road transport, green hydrogen can be used in fuel - cell vehicles (FCVs), such as cars, buses and heavy - duty trucks. FCVs use hydrogen and oxygen to generate electricity through fuel cells to drive the vehicle, with the advantages of high efficiency and quick refueling. In the field of aviation and maritime transport, although there are still some technical challenges, green hydrogen and its derivatives, such as green ammonia, are also expected to become clean alternative fuels in the future, helping these fields reduce carbon emissions.