This book explores the involvement of the United Nations High Commissioner for Refugees (UNHCR) and the International Organization for Migration (IOM) in the issue area of environmental and disaster displacement. In considering both agencies’ historical involvement, their response to Typhoon Haiyan, and first-hand accounts from both agency staff and other experts, this book outlines how inter-agency involvement in the issue area has been categorised by (real or imagined) divisions; of agency structures and mandates, activities, and even personalities. While historically inherited differences exist, environmental and disaster displacement has led to a converging of agency roles and amplified tensions, at a time when cooperation is most critical.