Because it's a pipe dream, no one pushing the “let’s turn wind and solar power into hydrogen” line has bothered with the Energy Return On Investment or EROI – the ratio between the energy delivered by a particular fuel source to society and the energy invested in the capture and delivery of that energy.

Then there are those other laws of physics. Attempting to contain the gas in large volumes comes with the threat of industrial scale explosions, thanks to its low ignition point and highly combustible nature, and also because it tends to leak easily from tanks. More than a few hydrogen storage facilities and filling stations have exploded – as to which, see below the image from Norway where one went up with one hell of a bang.