As a Humboldt Fellow, he is currently developing a monograph that explores the relationship between an ethics of migration and the human impact on the earth's natural environment. Focusing in particular on questions of borders and sovereignty, his project advances the claim that the very existence of a militarized international boundary might be among the clearest possible symbols of a sense of separation between the human and natural worlds. As sites of power manifested, of families separated, of alienation and friendship, of hope and hopelessness, and of the limits of civil and political order, borders are the starting point for an integrated theological ethics of migration and environmental degradation.