The hydrogen economy is today a reality knocking on our door. The term means a hydrogen energy storage system, its transfer and use. The main advantage of using hydrogen over fossil fuels is that it does not emit CO2 when used in the engine (fuel cell). At the same time hydrogen could replace fossil fuel reserves in the future.
Of course, the system has to be treated comprehensively - from hydrogen production to the end user. Now, most hydrogen is still produced using fossil fuels. This is the beginning. The real ultimate goal of a comprehensive, environmentally friendly hydrogen economy is to produce hydrogen through renewable energy sources (solar, wind, biomass) through steam reforming or electrolysis processes.