Liquid fuels, even low carbon liquid fuels, hold significant advantages over the use of hydrogen as a fuel. Not the least of these is the continued use of existing infrastructure, ease of use, safety, and energy density.
Globally, cows emit more "greenhouse gases" primarily methane, than do cars, primarily carbon dioxide. If greenhouse gases are a problem, the solution must be viewed comprehensively, rather than remaining myopically focused on transportation.
Even if you wish to power transport with the main power grid, say nuclear, the best way to do this may still be to process the hydrogen with other material to create a liquid fuel.
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