A yearlong investigation by The New York Times has uncovered a troubling connection between the U.S. car battery industry and lead poisoning in Nigeria. The report traces the supply chain for lead used in millions of U.S. cars to villages in Nigeria, where workers and communities are being exposed to toxic levels of lead. Peter S. Goodman, who covers economics and geopolitics for The Times, describes the economic and geopolitical implications of this supply chain, highlighting the global consequences of industrial practices.