It’s not an alternative to producing less of the damn stuff. But it can be turned into a useful material, not just stored. Ideally one that can replace, or reduce the carbon footprint of, materials like steel (~2B tons/year) and cement {~4B tons per year).

Something like this: Carbon capture process produces hydrogen and construction materials

Not necessarily exactly that, I have no idea if this one can live up to its promise. The hydrogen by-product has the potential to be extremely useful as a clean fuel but that depends on whether they can eliminate leaks during production.