The hydrogen ICE does emit water. I imagine a slew of these on a cold morning rush hour, no smog but certainly fog. Anyway, a great concept but not new, the real challenge is how to carry that volatile fuel. There are other alternative fuels, like these guys, www.carbonrecycling.is, they make synthetic methanol that burns 90% cleaner than fossil fuel. Not zero emissions but pretty good, mostly used in ships so far. It's evolving and, I think, more promising than plug-ins.
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