I drove 1800 miles in a Hydrogen Car

But producing hydrogen is very polluting: a huge part of H2 is produced by fossil fuel, mostly gaz and coal for agriculture (to make fertilizer). Even produce H2 thanks renewable energy can be more polluting because 75% of the energy is lost because of the elec-H2 then H2-electricity conversion and leaks. In US I don't know but in Europe it's very not reliable thanks nuclear power plants (and yeah my English is probably awfull 😅)