https://www.theguardian.com/environment/2012/aug/07/china-ra...
And e.g. neodymium extraction for wind turbine magnets produces waste with radioactive thorium https://inis.iaea.org/collection/NCLCollectionStore/_Public/...
https://www.evwind.es/2017/05/31/rare-earths-and-wind-turbin...
https://rmi.org/rmi-reality-check-greener-friendlier-alterna...
Furthermore, batteries do not require rare-earths. (A formerly-popular chemistry needed cobalt, which is not one.) Finally, "rare-earths" is just a name; the ones used industrially, including in some wind turbines, are not rare, and are anyway recycled.
So, no, no, and no.
We will need energy storage, eventually, after we have built out enough renewable generating capacity to charge it from. Fortunately, storage cost is falling very fast.
I certainly might be using the term "rare earth" imprecisely, but cobalt is used in most batteries and mining it is in fact detrimental to the environment. It's just much more localized pollution than releasing methane or carbon, which is for sure a win in the climate change fight.
You say storage cost is falling very fast, but again, what are the technologies being used backing up that storage you mention? I'm pretty sure it's batteries, but I'm totally open to facts saying otherwise.
Storage as anhydrous ammonia or liquified hydrogen is attractive because tankage is cheap and transportable, and it can be burned in existing turbines or sold to other utilities or to industry as feedstock, fertilizer, or fuel. International shipping is has begun converting to ammonia fuel.
Storage as liquified nitrogen is similarly attractive. The production equipment is very mature tech. LN2 is boiled in ambient air to drive a turbine.
Underground compressed air is attractive because it is simple and cheap. Extraction is via turbines, optionally spiked with fuel.
Underground hydrogen is common because it is simple and slots into existing NG infrastructure.
Various underwater methods -- compressed air, evacuated-cavity, buoyancy -- are very cheap if the mechanical parts remain onshore.
Battery chemistries competing with lithium use cheaper, often heavier, sometimes less inflammable materials. Iron, molten metal, sodium-ion, "flow".
In all cases, the determiner of competitiveness is economics. It is far from clear which aspects will dominate, and which will end up cheapest in them. Batteries cost per max MWh stored. Some cost per max MW in or out, with cheap tankage. Some are very cheap to construct and add onto. Some produce saleable surplus. Round-trip efficiency is all over the map, and in some is improving fast. Round-trip efficiency doesn't matter like it did when top-line generation was costly.
One thing we know is that Energy Vault, a $2B market-cap property, will not be in the mix.
Also consider that we will be able to recycle the materials used so the extraction should level off to only supplying potential market expansion and loss.
CCGT turbines are a bit different in that they have turbine first, and then the same steam boiler to turbine setup.
That is why I ask. All generation from mechanical sources needs generators, they need control circuitry. Steam plants need boilers, cooling towers and what not.
Just wanted to point out that singularly focusing on "hurr durr renewables need to dig stuff out from the ground and not made using pixie-dust" is quite the irrelevant take since the entire energy generation industry shares so much complexity, no matter the source of energy.
Is iron mining and refining as toxic as, say, lithium? Particularly when adjusted for how much extra mining you have to do for a particular amount of end product?
Just throwing out factors to consider like you are doing (and I just did) is not very useful unless you also include some numbers for scale. Do some research and share.