Some will move for sheer survival, others as part of a family strategy to maximize household incomes. Equally, not all migration arising from environmental change effects will be long term. Natural disasters tend to generate temporary movements if the affected area is still habitable, while slow-onset processes may lead to long-term or permanent migration. In making a case for migration capacity-building in response to future challenges arising from the effects of environmental change, the need for policymakers to be able to justify their priorities is evident in this report.