Misha Glenny explores the world of rare earth metals. Reducing CO2 emissions requires critical raw materials like lithium, cobalt and nickel but mining and processing them can pose a serious threat to the environment. Can we solve the paradox? Guests: Dr Julie Klinger, Assistant Professor in the Department of Geography and Spatial Sciences at the University of Delaware and author of Rare Earth Frontiers: From Terrestrial Subsoils to Lunar Landscapes Teresa Ponce De Leao, chief executive of the Portuguese National Laboratory of Energy and Geology Henry Sanderson, author of Volt Rush Guillaume Pitron author of Rare Metals War Producer: Ben Carter Editor: Hugh Levinson Sound engineer: James Beard Production coordinator: Janet Staples