The State of Environmental Migration 2011 is the second of an annual series, which aims to provide the reader with regularly-updated assessments on the changing nature and dynamics of environmental migration throughout the world. Written by students of the Paris School of International Affairs (PSIA) of Sciences Po, this volume's case studies analyze the migration flows that were induced by some of the most dramatic events of 2011—both sudden disasters and slow-onset events. IDDRI and IOM have initiated, supervised and edited the volume.