Are hydrogen-filled cars pie-in-the-sky?

Unless I am really off-base, I think the economics and politics involved will dictate that the major demand for hydrogen-fueled vehicles will be in mega-cities that can no longer support the endless stream of carbon monoxide spewing commuters driving in-and-out each day. These cities may reach the point where the only individual commuter transportation allowed past outer-perimeter toll plazas or automated traffic control

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