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 slowonset processes may lead to longterm or permanent migration in making a case for migration capacitybuilding 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