In this edition of the Munk Debates, four of the worldâ€™s leading thinkers square off to debate one of the most important geopolitical issues of the time: are Iranâ€™s nuclear ambitions a global threat?The Munk Debates are Canadaâ€™s premier public policy event. Held semi-annually, the debates provide leading thinkers with a global forum to discuss the major public policy issues facing the world and Canada. Each event takes place in Toronto in front of a live audience, and the proceedings are covered by domestic and international media. Participants in recent Munk Debates include Tony Blair, John Bolton, Niall Ferguson, Rick Hillier, Christopher Hitchens, Richard Holbrooke, Henry Kissinger, Charles Krauthammer, Paul Krugman, Stephen Lewis, Dambisa Moyo, Samantha Power, Lawrence Summers, and Fareed Zakaria.The Munk Debates are a project of the Aurea Foundation, a charitable organization established in 2006 by philanthropists Peter and Melanie Munk to promote public policy research and discussion. For more information visit www.munkdebates.com.