Sammy Roth travels to Esmeralda County, Nevada, to meet Naomi Fraga, a botany professor at Claremont Graduate University, and see the endangered Tiehm’s buckwheat up close. The wildflower stands in the way of one of the country’s biggest proposed lithium mines — a project supporters say is crucial to the clean energy transition. This is Part 1 of a special two-part episode.