Given the current state of battery technology, lithium is an essential material in most EV batteries. But most of it is sourced overseas. GM, in the midst of an EV push centered around its Ultium battery tech, wants to change that, announcing a major investment in a California lithium extraction project taking place at a geothermal energy plant near the Salton Sea. Given the battery pack size of a massive vehicle like the upcoming GMC Hummer EV, the appeal of significant local lithium...

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