The BIGGEST problem with clean energy

As a physicist, it is shameful that you are propagating the idea of 100% renewable.  The concept violates the actual laws of physics.  The machinery of all of this breaks down over time and will necessitate replacement.

Beyond this, what is equally disappointing is that you are not looking at the entire system of things.  It is one think to talk about the energy efficiency of making hydrogen and look at it as not good without fully considering the insane costs and environmental space and impact of solar, pumped hydro and so on.  Along with this, there is also the fact that negawatts is FAR more important than seemingly anyone knows or realizes.  EEV blog did a fantastic breakdown on wired smoke detectors and their horribly inefficient AC/DC conversion.  The grid losses to this in Australia (Where he lives) are massive for such an innocuous and yet required, piece of household technology.  It is beyond question that there are many more such issues all over dwellings and offices around the world.  Not needing that power at all is far more beneficial than simply trying to make more power that is inevitably more expensive than classic thermal plant power.