A problem has been forgotten by public - "over 80% of the global supply chain of rare earth elements, important minerals for electric vehicles and wind turbine components, is controlled by China." "China controls 51% of the global total of chemical lithium, 62% of chemical cobalt and 100% of spherical graphite — the major components of lithium-ion batteries."
Afghanistan is home to what is believed to be one of the richest reserves of lithium and China would be take control the mining.
Battery vehicles are not just about economic or environment issues, but also about the energy security of the nation.
The problem with statements like that is they're usually based on proven reserves, i.e. what the mining companies have decided is reasonable to dig up at the moment. Despite the name, rare earths are not rare. But they're usually bound up with other elements in rocks.
China are currently willing to do the dirty work and extract things like lithium for a cheap price, so the rest of the world leaves it up to them. We could potentially produce lithium ourselves, there have been news reports about an abundance of it in Cornish brine. But it would cost more so we don't bother. If China becomes problem, then we have another look at the Cornish mines.
It's similar to North Sea Oil. Previously it was considered too harsh an environment to extract oil from sensibly. Then OPEC flexed their muscles in the 70s and we decided that actually exploiting it would be worthwhile.