Non-Renewable Parts Of the Renewable Solar Voltaic System

Did you know there's stuff in a solar photovoltaic system that aren't renewable? I figured as much, but I thought it would just be silicon or something. That stuff's everywhere. But it turns out it's something nobody's ever heard of--least of all me.

Indium is an element used in solar PV systems. Apparently, there's a supply constraint and possible limits to the amount easily accessible. The indium is used to beat the limits that silicon by itself has in electrical conduction.

There's a long report detailing this at Fast Company here, at this link.