Well I would postulate, as a complete layperson, that the amount of lithium leaching out of rocks into the ocean is more per year than we could realistically extract. So in a way, it could be sustainable.
I mean, it’s about as sustainable as you can get on earth I would imagine, there’s a huge amount of lithium in seawater. It would take an insanely long time to deplete the 180000000000 tons of lithium in sea water.
Looks like the weed bust got them trying new things…