Blue Hydrogen

Blue hydrogen is made from natural gas by steam-methane reforming or autothermal reforming, with carbon capture and storage applied to the process CO2, positioning it as a lower-carbon bridge to green hydrogen. Its actual lifecycle benefit hinges on the capture rate achieved and on upstream methane leakage from the gas supply, both of which can erode the saving. In marine fuel accounting it is judged on its well-to-tank emissions, not on the label.