Two thoughts:
1. Burning hydrogen produces water vapor. Water vapor is the largest component of the greenhouse gas mix. They want to stop burning high energy hydrocarbons with low energy H2. ‘Environmentalists’ are not mentalists if you catch my drift.
2. If we start removing hydrogen from the US mid continent rift (mother of all fracking) just imagine the earthquakes THAT could spawn. There is modern history in that rift.
To me, this suggests using hydrogen to fuel large scale use (e.g., generating electricity) where the water vapor can be captured, processed, and distributed for large-scale water use (e.g., cities, irrigation). Nebraska has thousands of those circular sprinkling system in the state. Since it’s on the rift, generate power for the area by burning it and use the resulting water to irrigate crops in the area.
Using liquid hydrogen to power cars seems more difficult because it is less energy-dense that distillate fuels and water capture probably is not possible.
I don’t know the cost, but it sounds like a win/win to me.