Hydrogen at large is black(brown?) hydrogen. So they should be good for now.
Not the case in countries like Germany where they have a surplus of wind
The article mentions hydrogen from electrolysis of water, but I think a bigger source in the future could be steam reforming of biomass. That is, when you heat biomass (plant matter, sewage sludge, maybe even municipal garbage) to about 300C in steam, the organic matter breaks down into simple molecules like hydrogen, carbon monoxide (highly flammable!), methanol, elemental carbon (biochar) and miscellaneous others. Some of those molecules can be recovered for important chemical feedstock (since we won't have petroleum or natural gas as feedstocks anymore, right?), and the gas can be fuel.
In the early days of natural gas use, towns would "reform" the methane (CH4) by reacting it with steam to make carbon monoxide (CO) and 3 molecules of H2 - a mixture known as "city gas". It is not new technology.
That's what they do for the metro system in Monterrey and some public lights (couldn't find an English version of this info.): :
https://www.somosindustria.com/articulo/transforman-basura-en-energia/
Ironically, Monterrey still has a lot of metallurgy, cement industry and car-dependency that doesn't help this kind of projects.
How do you address the problem of hydrogen pitting the tanks and pipelines tho? Or do you just replace the pipelines every few years??
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