The BIGGEST problem with clean energy

Great, the other options for storage come with high efficiency percentages. Electrolysis --> hydrogen -> fuelcell is horribly inefficient compared to other, mature options. And 40% is wishful thinking rather than reality, its more like 25% today. And of course, Li-Ion-Batteries have a fire-risk, hydrogen of course does not. It's like the Hindenburg never existed in Diannas world, sponsored by Toyota...