H2Gen in Alexandria had a pallet-sized Hydrogen Generation Module (sold to Air Liquide in 2009) to produce hydrogen on site from natural gas - Just drop the pallet with a forklift, hook up a gas line and electricity. Other reformers can be made to convert other common fuels into hydrogen for fuel cells (gasoline, diesel, ethanol, propane). It could allow for rapid and scalable roll out of fueling capacity.
This process emits some pollution, but the net for natural gas conversion is supposedly about half the total emissions of burning the equivalent of gasoline, so it is still an air quality improvement for urban environments.
You can also deliver hydrogen from trucks to storage tanks, to really clean up the air in geographically disadvantaged places like Los Angeles or Mexico City.
I don’t know the hard economics of what is lowest cost, the relative performance advantages, or the importance of the safety issues; but the logistics of standing up a fueling infrastructure for hydrogen is quite feasible.
Hydrogen would be better as a static generation source than for transportation until they can solve the storage and logistical problems.
Feasible engineering doesn’t mean it actually delivers what the global warming hoaxters claim. What they claim is just a bundle of lies.
Electricity has to be generated for a natural gas-to-hydrogen reformer to operate.
Fuel has to be burned in trucks to deliver the huge tanks needed to transport hydrogen.
Los Angeles could cover itself with photovoltaic arrays and take itself off the grid; it could require all vehicles run directly on electricity (batteries, or overhead lines for trolleys) or hydrogen, and use the photovoltaics to produce the hydrogen as a storage system to bridge the period of the day (known as “night”) when the cells weren’t doing anything but electricity was still being used; and of course, electricity would be needed to run the desalination of seawater that they are geographically advantaged to access.
And the wealthy showbiz jackasses in the Los Angeles basin could pay for it themselves, and leave the rest of us out of it. For the first time in their miserable lives they’d actually acquire some moral high ground — on that one issue. The rest of the country which paid for the huge water projects could then cut them off from both the hydroelectricity supply and water pumped from the reservoirs to their canals.