I hope you will like to know about reversible fuel cell technology. It doesn't require any rare Earth materials. It is based on membranes which reversibly generate green hydrogen fuel from solar power. Cells based on this tech act like batteries until charged, which gives us the battery function needed to back up PV solar power overnight, but if the capacity of daylight solar is large enough, we can in addition accumulate hydrogen fuel which functionally replaces fossil fuels, with none of the pollution in combustion.
Fuel system Engineers know how to convert Engines designed to burn fossil fuels, to burn hydrogen instead, and how to convert pipelines meant for fossil fuels, to hydrogen transport, and even fuel tankers to carry hydrogen.
The reason this is not particularly well known is, I suspect, because a wholly solar powered humanity has to drop capital, as the essential thing of value.
It isn't, it never was, never should have been.
Energy is the real thing of value, it comes only from the sun, our economy has never really reflected that, but has to now, because we have to stop deriving energy from the capital of Earth.
Most people currently living from capital (Most people!) don't like the sound of that, including all banks, governments, and corporates.
That is why this is not really propagated information, I believe.
But we are learning.
Anyone can read more about "Kardashev Money", by searching for it.