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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:\nDr 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\nTeresa Ponce De Leao, chief executive of the Portuguese National Laboratory of Energy and Geology\nHenry Sanderson, author of Volt Rush\nGuillaume Pitron author of Rare Metals War

Producer: Ben Carter\nEditor: Hugh Levinson\nSound engineer: James Beard\nProduction coordinator: Janet Staples