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A car fueled with hydrogen is not a pollution source, since the combustion product of hydrogen is water vapor (which is, technically, a greenhouse gas, but the hydrogen was almost certainly produced by elecrolysis of water in the first place, so it cancels out). The carbon footprint of actually producing the car and maintaining it, however, may be significant. Particularly since the energy for electrolysis to produce the hydrogen to run it has to come from somewhere, and most of our electricity comes from burning fossil fuels.

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16y ago

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