This paper considers whether states have a duty to accept those who cross borders to escape environmental disasters associated with climate change. It then examines how such a responsibility might be distributed, focusing on the predicament of the citizens of small island states expected to be inundated by rising sea levels. In assessing states' responsibility to admit these individuals, I draw on Walzer's theory of mutual aid, demonstrating that even under this narrow conception of states' obligations, a duty to accept (...) displaced islanders can be established. However, the proximity principle is ill-suited to determining which states should shoulder responsibility in this situation. Drawing on Miller's account of remedial responsibility and his ‘connection theory,’ I suggest that the obligation to accept ‘environmental refugees’ should be shouldered principally by affluent states that share significant degrees of causal and moral responsibility for climate change, and also have particularly strong capacities to assist the displaced. (shrink)