In 2021, the Biden administration put out a report about gaps in the supply chain for electric vehicles. It estimated global demand for lithium and graphite would grow by more than 4,000% by 2040 if the world were to achieve the climate goals laid out in the Paris accords. These materials, along with copper, nickel and others, are critical to green technologies. And there is a global fight over their supply, one that Reuters correspondent Ernest Scheyder documents in his new book, “The War Below: Lithium, Copper, and the Global Battle to Power Our Lives.” He told Marketplace’s Lily Jamali about why lithium, in particular, is in such high demand and the challenges of bringing it to market.