For a bloke devoting his career to hydrogen, Professor Greg Metha has a surprising amount of sympathy for Saul Griffith’s view that Australia will waste its renewable energy resources if it focuses too heavily on making green hydrogen.

“Right now when we’re screaming for as much electrons from renewable energies as we can [get], I just can’t see how it’s going to be economically viable to use a significant proportion of that electricity to make hydrogen,” he tells this week’s Tech Zero podcast.