There's an idea to do this with old oil and gas wells. Only hydrogen comes out of the well, the carbon stays underground. https://fuelcellsworks.com/news/proto

There's an idea to do this with old oil and gas wells. Only hydrogen comes out of the well, the carbon stays underground. https://fuelcellsworks.com/news/protonh2-launches-project-apollo-to-produce-500-tons-of-low-carbon-hydrogen-daily-for-under-1-per-kg https://fuelcellsworks.com/news/protonh2-launches-project-ap...