LH2 is an very energy-efficient fuel that is otherwise the worst possible liquid fuel choice you could make. It requires cryogenic cooling, causes embrittlemen

LH2 is an very energy-efficient fuel that is otherwise the worst possible liquid fuel choice you could make. It requires cryogenic cooling, causes embrittlement in materials it comes into contact with, has a very poor volumetric energy density, and has almost no existing infrastructure in place. Even if you lost 50% of your energy in conversion to synthetic methane or propane you would be better off using a synthetic version of a fuel we already know how to handle well.