• Ok, but carbon dioxide isn’t the alternative energy transport option, is it? Crude oil is, and a crude oil spill is far worse than a liquid hydrogen spill.

    Containing a fire from a leak would be an issue for visibility. However, if there’s a catastrophe comparable to an oil spill in the open, liquid hydrogen (a) converts to gas and evaporates into the air and dissipated - it’s so much lighter than air, they used to use it to float enormous steel cages around; (b) it’s flammable, but not guaranteed to catch fire, and when it does burn, it produces water. There’s no other byproduct - just water.