Climate change has rapidly expanded as a key topic of research across disciplines, but it has remained virtually untouched in nationalism studies. Climate change is a boundless, uncontainable phenomenon that ignores class, geographic, and ethnonational boundaries. As such, it can hardly be comprehended within the limits of a nationalist world vision. This article reassesses this intuition by focusing on the situational and adaptive plasticity of nationalism, characterized by its notorious Janus-faced adaptability. I first identify and address a methodological stumbling block that precludes scholars in some areas of the humanities and social sciences—specifically nationalism studies—from conceptualizing and grappling with this unfolding reality. Second, I advance a typology that can work as a conceptual grid for studying similar problems that emerge at the intersection of environmental politics, climate change, and nationalism studies. I suggest two ways in which the nation and national narratives have been and are being mobilized to make sense of, contrast, reject, and incorporate new life-changing trends. I identify these, respectively, under the umbrella terms resource nationalism and green nationalism. I conclude by emphasizing the continuing relevance of nationalism in plans for ongoing global energy transitions.