Thankfully, we're not really in any danger of depleting the earth's lithium. We probably don't have enough mines currently to easily support the demand, but there is plenty of the stuff on the planet. We're getting better at finding it and mining it, and there is an option to recycle it from existing batteries, too. I'm sure we will have new chemistries in the next decade or two that help as well.
We do love to solve our last problem by creating new ones of larger size, though. I also still drive a diesel along with the EV, but the Tesla largely meets all of my needs both for commuting and travel (as long as I'm not in a hurry). They're overpriced and the interiors are crap, though.
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