The World Economic Forum Global Risks Report was released in Davos and it lists extreme weather events and climate-change are the gravest global risks in the next 10 years. The report is a survey in which nearly 1,000 decision-makers from the public sector, private sector, academia and civil society assess the risks facing the world. NDTV's Vishnu Som is in Davos and spoke with head of Global Risks and Geopolitical Agenda at the World Economic Forum, Aengus Collins.