A discussion featuring an address by Dr. Tedros Adhanom, Director General of the World Health Organization (WHO). The world today is trying to manage health risks associated with population growth, climate change, deforestation, institutional collapse, state failure, accidents, human error, war and terrorism. The full range of risks include infectious disease outbreaks, biological, chemical, radiological and nuclear spill-overs or attacks, multiple hazards, food insecurity, state fragility and cyber security failure or attacks. This is a breath-taking range of risks and no single institution can tackle it alone. It truly is humanity's common concern. As the UN agency responsible for global health, the World Health Organisation (WHO) is the organizational expression for humanity's common concern and we are honored to have the recently elected Director-General Dr. Tedros Adhanom address us on the priorities for his leadership. To discuss and debate with Dr. Tedros, we are delighted to have world leading experts in development, disease control and prevention and climate change and health dissect the opportunities and challenges in managing the health risks the world faces today. Welcoming Remarks: Lee C. Bollinger, President, Columbia University in the City of New York Introduction by: Jeffrey D. Sachs, University Professor; Director, The Center for Sustainable Development in the Earth Institute; Professor of Health Policy and Management, Columbia University in the City of New York Participants: Jeffrey D. Sachs, University Professor; Director, The Center for Sustainable Development in the Earth Institute; Professor of Health Policy and Management, Columbia University in the City of New York Elizabeth Cameron, Senior Director, Global Biological Policy and Programs, Nuclear Threat Initiative (NTI) Gavin Schmidt, Director, NASA/Goddard Institute for Space Studies, The Earth Institute, Columbia University Moderator: Wilmot James, Former Shadow Minister of Health (South Africa); Visiting Professor of Pediatrics and International Affairs, Columbia University in the City of New York