In transport, the era of all-oil, all-CO2 is coming to an end. The new era will involve a variety of energies (gas, electricity, hydrogen) depending on use and distance. It will also require massive investments in supply networks. But many technological uncertainties remain to be resolved, and they can only be resolved at different times. Stakeholders in this transition - manufacturers, transporters, energy providers, local authorities - will discuss the issue, with a particular focus on hydrogen.