I presume the OP was referring to magnets. Rare earths are used to make stronger permanent magnets, which are used to make more efficient electric motors (for

I presume the OP was referring to magnets. Rare earths are used to make stronger permanent magnets, which are used to make more efficient electric motors (for both plug-in and battery tools). This looks to be an intro article: https://qz.com/1999894/why-rare-earth-magnets-are-vital-to-the-global-climate-economy/ https://qz.com/1999894/why-rare-earth-magnets-are-vital-to-t....