Hydrogen demand around the world is projected to grow significantly by 2050. Some of that supply could come from nature itself.
While we’re digging around down there, we could take the heat directly, i.e. geothermal.
There probably wouldn’t be enough heat for that in most cases.
From your own link…
Another process, thermogenic hydrogen formation, occurs in deep sedimentary basins when organic material decomposes under high temperatures, roughly 480 to 930 degrees Fahrenheit (250 to 500 degrees Celsius). These reactions can also produce hydrogen alongside other gases, such as methane or nitrogen.
That’s enough for geothermal energy extraction and direct use heating.
Geothermal Power Plants typically require temperatures between 210F and 700F to create steam that drives turbines. Dry steam plants can operate with temperatures over 455F.
Direct-Use Heating uses geothermal fluids in the 100F-300F range for industrial processes, greenhouses, and district heating.
Geothermal requires a enduring source of heat to be viable. So you are mostly looking at volcanic sources. The heat in many of these formations will probably not last long.
