The idea is to use them for H2, and not throw away all that work and existing infrastructure.
NTT to study hydrogen transportation through existing pipelines
Green Car Congress.com | 26 July 2022
NTT Anode Energy Corporation announced a joint research and development project to study safety measures for the mass transportation of hydrogen through existing pipeline infrastructure. The study, being performed in collaboration with the National Institute of Advanced Industrial Science and Technology and Toyota Tsusho is expected to contribute to the realization of a pipeline transportation model for hydrogen that could be implemented globally.
https://www.greencarcongress.com/2022/07/20220726-ntth2.html
Many people think hydrogen cannot be piped - but they don't know history.
"Town gas" or "Coal gas"- which heated the UK and other nations before the North Sea natural gas fields came on line in the 1960's was ~50% hydrogen.
https://en.wikipedia.org/wiki/Coal_gas
You might be surprised at what you don't know about the current worldwide hydrogen energy revolution that is taking place right now while Americans bicker amongst themselves. And for the record, I'm not here to argue - especially with rude, arrogant, condescending, angry fan boys of a particular tech.
You talk of urgency to combat global warming, that's what I'm interested in.
Hydrogen can help. NOW. It's not the only thing, it's a part of a holistic approach.
And while the next rounds of nuclear plants are built, you can watch hydrogen fuel cells combat climate change. Or, you can ridicule the tech and those working on it. Your choice.