Hydrogen from sewage

Here's a source of hydrogen.  Let's say that hydrogen is converted into ammonia, which can be transported anywhere conveniently.  It can then be put into autos which can electrolyze it back into hydrogen for fuel cells.

Or, the ammonia could be used to power buses.  The idea is to avoid using a lot of energy to put it into a convenient form.  The in situ electrolyzer will convert it back into hydrogen for the fuel.

By using sewage, a cheaper form of hydrogen can be obtained which will "kill two birds with one stone".  First, clean up the sewage, and two, produce a clean fuel for transportation.  But there's an additional reason.  That is to provide a market for fuel cells which enable mass production, and thus lower costs.  The more this technology is adopted, the greater the possibility of mass acceptance in the market.  Hopefully, it can remove the obstacle of high costs for fuel cells and electrolyzers.