In this exclusive series of interviews, we speak to Ertharin Cousin (Executive Director of the United Nations World Food Programme), Prof. Jeffrey Sachs (Director of the Earth Institute at Columbia University) and Carlos Pérez del Castillo (Chair of the Board of the CGIAR Consortium). We look at the true scale and nature of global hunger, exploring issues ranging from poverty to climate change, conflict to politics, economics to education and more. We discuss the realities of hunger in our world and how we can end it.