Making "White" Hydrogen - Pity About the Ophiolite

I came across THIS ARTICLE which discusses the various means of making Hydrogen, most of which are very environmentally unfriendly. There is a colour coding of Hydrogen which describes how it is made.

And the "greenest" hydrogen is White Hydrogen! This is already being produced by natural geochemical processes. This involves the weathering of basic igneous rocks.

This could be industrialized by pumping water and carbon dioxide into ophiolites. This produces serpentine, magnesium carbonate and hydrogen. So get rid of carbon dioxide and produce hydrogen! 

This sounds very good. Presumably there would be difficulties, but the techniques used are those of the oil industry which might encourage their use.

As far as I am concerned the downside is the change of lovely ophiolites into less lovely serpentinites.