...one step further. Scientists have found a way to turn hydrogen sulfide into hydrogen fuel.
Hydrogen sulfide comes from a variety of sources, but one of the major ones is, uh...poop.
So, yes, in the future we might be extracting this gas from waste treatment plants and turning it into hydrogen for fuel cells. Manure piles would also be a good source.
(It also comes from paper production, mining, and a few other industrial sources).
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