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No offense, but this is the sort of fuzzy thinking you get from people who do not do the math. Just how much sea water will you need to break up to produce enough hydrogen to power even one car, never mind millions? How much do you think it will cost to manufacture, assemble and maintain this enormous array of photovoltaic cells (have you ever even priced a small array to say power part of your house)? Have you ever seen a hurricane (aka typhoon) and the damage it can cause, howe well do you think a multi-square mile solar panel array will stand up to one of these? Where will the oxygen from the sea water go? After all, producing hydrogen and oxygen by electrolysis is hardly new. I did this on a small scale in my kitchen many years ago. Neither are photovoltaic cells. If it this approach is so good, why isn't it used today to produce the large volumes of hydrogen and oxygen used by industry? The answer is simple, it is easier and cheaper to make hydrogen from hydrocarbons and oxygen by air separation. Yes, landfills produce methane, they also produce hydrogen sulfide and other noxious gases that must be removed from the methane before it can be used to produce hydrogen. Again, why not just use cow farts (the volume of which exceeds the amount of methane produced by landfills many times.
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