Why Sustainable Power is Unsustainable

Shortage of Indium means PV cells could become very expensive, which
might make it more economical to put them into space where they are
continuously illuminated. Putting your expensive PV cells on Earth,
where they are in darkness most of the time, makes them a
non-performing asset (for most of the time), and is bad business practice.
Also demand for Platinum (for fuel cells) will exceed supply causing
the price to sky rocket. Might become economical to go after
Platinum asteroids near Earth.