The increasing energy consumption, the depletion of natural resources, the pollution, waste disposal and anthropogenic CO2 have made “energy transition” the essential challenge for the planet. In the next future renewables, fuels, energy carriers and green feedstocks (in particular hydrogen) play a key role in advanced industrial societies. Hydrogen can play a substantial role in alleviating emissions in the coming decades and can serve as a crucial link in the energy transition pathway of sectors otherwise difficult to decarbonize, such as some transportation and industry. Hydrogen can be used both as feedstock and energy carrier. It can facilitate the integration of large quantities of variable renewable energy sources to provide flexibility in the energy sector.  Hydrogen in connection with renewable energies and CO2 can also make possible to derive fuels and molecules that can be used both for energy and “hard to abate” industry.