This article is on repurposing pipelines such as natural gas for hydrogen transportation. There are so many ignorant badmouthers that say the sky is going to fall if the natural gas pipelines are used for hydrogen. The standards worldwide show that hydrogen pipelines are nothing new. Hydrogen has been made and transported for almost a hundred years.
https://pemedianetwork.com/hydrogen-economist/articles/strategies-trends/2023/repurposing-pipelines-for-hydrogen-transportation/