What is Elon Musk doing about lithium?

So, I've been hearing a lot about Elon Musk's involvement in the electric vehicle industry, and specifically with Tesla. And as we all know, lithium is a key component in the batteries that power these cars. So, I'm curious to know, what exactly is Elon Musk doing about lithium? Is he investing in lithium mining operations? Is he working to develop more sustainable and environmentally-friendly ways to extract lithium? Or is he focusing on other aspects of the electric vehicle industry and leaving the lithium sourcing to others? I'd love to hear your thoughts on this.