Methods of producing some new types of transportation fuels (especially electricity and hydrogen) at large central plants have the potential of being able in principle to separate out and “sequester” the CO2 emissions, though the cost and feasibility of this is still being proven. Some
fuels can also be produced in a more decentralized fashion, such as small-scale production of hydrogen through steam methane reforming; however, these CO2 emissions would be harder to capture and remove.