Oops! You missed a step. When the hydrogen is consumed as fuel - a very good thing - water is formed in the atmosphere which precipitates as rain. This rain will eventually wind up in the oceans - they get refilled. We therefore have a virtually perpetual fuel source.
If this technology works, it will be a great thing. I was making fun of global warming nuts, whose goal is destruction of modern society, and control of our lives, not protection of the environment. You watch, if all our cars run on hydrogen and only water is the byproduct, you will see them come up with a theory that makes that a bad thing. Cars give people freedom; that threatens socialists.