California’s toxic Salton Sea is a treasure trove of lithium – a critical ingredient for powering the country’s clean energy future. The estimated 18 million metric tons of lithium suspended in hot geothermal brine is enough to power more than 375 million EV batteries. So what kinds of new tech are companies using to get to this lithium despite the corrosive conditions? WSJ takes you behind the scenes to understand how companies are building entirely new ways to extract lithium from the area and what it means for the future of domestic lithium production.