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^Hydrogen extracted from the water is combined with oxygen in the engine. To make water. You're not reducing the water table. And even as it were, some countries- notably those on the Arabian peninsula- get a majority of their water through desalinization of ocean waters.
Also, the setups don't require the water be purified/distilled- in fact, salts or other electrocatalysts are typically added to decrease resistance through the water and significantly increases the efficiency of the conversion.
I don't know why people would be adverse to running it on urine (except for maybe the ladies, but I'm probably stereotyping this one), but that wasn't the point I was alluding to- my point was that urine can be collected from sewage plants, broken down into it's components and the hydrogen could be collected and distributed much in the same way that other hydrocarbon fuels are.
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