There are still some details to be worked out when it comes to the use of Hydrogen, esp. in industrial applications e.g. local transports. Hamburg, Germany is spearheading that effort and testing this technology with a small fleet of city busses. Rather than talking about it, they’re applying their resources, learning from their experience, and developing solutions. This is, as one would say, where the rubber meets the road.
In the end, the future is about living in a responsible, sustainable way. When more of us feel that spiritual connection with all life around us, we really need no reason … for doing harm, intuitively, is not the way.