He says the tech could challenge batteries in both efficiency and environmental friendliness.
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Oh? Where does the hydrogen come from? Currently it comes from hydrocarbon fossil fuel. In other words, you discard the carbon and store the hydrogen.
Hello? Discard carbon? “Environmental friendliness”?
The practical offshoot of this issue is that you have to waste lots of carbon. Burning carbon provides the majority of the energy provided by burning hydrocarbons. Why would you discard overt half of the energy contained in hydrocarbons?
Because you’re an idiot.
That's true and it will always be more economical to use natural gas. But there will be more and more renewable power used electrolysis or other forms of energy storage. Renewables simply won't work without storage.