Hydrogen is a distraction. It is a storage form for energy, and not a particularly good one (takes up too much volume and needs to be highly pressurized). To produce hydrogen in large quantities, one could run an electric current through water to produce hydrogen and oxygen gas. If so, why not just store the electricity directly in a battery, which is safer, more convenient, and more energy dense (greater energy capacity). Ultimately, hydrogen is still a form of internal combustion (you're still burning H2 to harvest the energy stored in the chemical bonds). We need to move away from internal combustion, whether by embracing electricity or other alternative fuels.