Turned out unicorn farts are not a good source of energy, nuclear energy is a good source but is scary because scary, and the rest is way too hard (and slow) to

Turned out unicorn farts are not a good source of energy, nuclear energy is a good source but is scary because scary, and the rest is way too hard (and slow) to scale to the energy levels we need. Yes, I know some tiny country managed to produce 100% of it's energy by some exotic source, just as I know somebody implemented a fully functional OS in Brainfuck. That doesn't mean Brainfuck is a viable industrial system programming platform. And exotic energy is still not a viable stand-alone solution for overall world energy needs (especially if you count transportation). So PR is one thing, but the reality turns out to be a bit different.