Hydrogen fuel - in its range of forms - is being put to the test by many types of transportation: from cars, trains and forklifts to ships, submarines and rockets.
Building on the success of liquid hydrogen fuel in space travel (including NASA Space Shuttles), aerospace companies across the globe are pursuing hydrogen as fuel for both crewed and uncrewed planes.
Within the automotive sector, successful hydrogen fuel trials have led to the mass production of small private vehicles, as well as military transport and heavy goods vehicles, such as parcel delivery trucks.
Hydrogen fuel technology is also helping to reduce CO2 emissions and fossil fuel dependence in public transport. Alongside buses in Poland and tramcars in China, there are trials underway with commuter-filled trains in Germany, Japan and the UK.