This article examines some of the different mappings of the globe by ecocritics and postcolonalists and the role of militarization as a constitutive part of both globalization and planetary thought. It discusses the historical connection between ecological thought and radioactive militarism and describes how postcolonial approaches can contribute an important critique of universalist modes of globalism. It also explores postcolonial ecocriticism’s emphasis on discourses of alterity and difference.