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there are new exploited deposits of hydrogen, formed at great depths under high pressure and temperatures. https://hydroma.ca/en/ is one I do not know if there are more and their production volume?

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It's still a fossil fuel though. Not emitting climate affecting gasses one but still.

Turns out releasing hydrogen in the atmosphere has some greenhouse effects: http://www.ghgonline.org/otherhydrogen.htm

No, It is a reaction between buried iron oxide and water. This is very high temperature high pressure reaction. The iron oxide changes oxidation state, releasing hydrogen. Here is one, there are others, like the one I cited. https://www.preprints.org/manuscript/202010.0589/v1/download

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