Hydrogen has a number of unique safety issues: http://en.wikipedia.org/wiki/Hydrogen_safety http://en.wikipedia.org/wiki/Hydrogen_safety Unlike most gasses, hy

Hydrogen has a number of unique safety issues: http://en.wikipedia.org/wiki/Hydrogen_safety http://en.wikipedia.org/wiki/Hydrogen_safety Unlike most gasses, hydrogen gas flowing through leak warms up, and the low ignition energy means this can be enough to start a fire, and hydrogen flames are invisible. I'm not a chemical engineer, but I would assume that methane infrastructure cannot simple be re-used for hydrogen without significant changes.