The link between climate change and migration has become one of the major foci of interest in migration governance, in part because ‘climate migrants’ are difficult to fit within existing legal and policy frameworks. At the same time, many States and the EU are seeking to develop a more ‘sustainable’ migration law and policy, incorporating environmental and social dimensions of sustainability. In this chapter we consider climate change and migration as sources of (perceived) ontological insecurity, and how States respond to this. We focus on the example of the Netherlands, which is one of the world’s lowest-lying countries and is heavily reliant on migrant labour. We examine the case of EU migrant workers in low-paid and flexible jobs in the meat sector, on the one hand, who are seen as necessary but not per se desirable and, on the other hand, TCN students and researchers who are seen as highly desirable but nonetheless have an ambivalent position in the Netherlands. We seek to illustrate some of the questions of environmental and social sustainability through these two case studies, and to ask what it means to develop a truly ‘sustainable’ migration policy in the light of the ontological insecurities of the Anthropocene.