How does environmental displacement fuel violent conflict? Worldwide environmental violence uproots more people every year than war, and the alarming acceleration of environmental displacement has generated significant speculation about its security consequences. This chapter undertakes a review of the literature linking environmental migration and violent conflict to: (1) map the complex causal pathways linking environmental migration to the onset and dynamics of political violence; (2) evaluate the “state of the evidence” or available empirical support underlying claims of an environment-migration-conflict link; and (3) identify gaps in existing literature. By systematizing existing research, this chapter seeks to clarify the state of knowledge on the environment-migration-conflict nexus, identify points of consensus and debate, and chart a path forward for future research. The review finds that while existing research suggests environmental displacement fuels civil war and communal conflict, there is a dearth of research addressing how environmental migrants may experience violence at the hands of the state. In addition, more comparative research is needed to gain deeper insights into the conditions under which environmental displacement impacts political violence.

This chapter examines categories that are not traditionally considered as vulnerable because there is a recognized protection need, but residence permits on humanitarian grounds become a practical solution where there is not clarity about the type of permits they are entitled to. The chapter examimes the humanitarian and the rights-based justifications to grant residence permits to these categories.