Contesting the U.S.-centric bias of modern environmentalism, this essay uncovers an “old“ paradigm of environmentalism found in the medieval Islamic tradition, the Islamic Ecological Paradigm (IEP)—which, in many respects, is tantamount to many ideologies of modern environmentalism. According to IEP, human beings are a part of, and not above, nature, and have the responsibility to preserve nature. Many paradigms of modern environmentalism have largely embraced this ideology, though they do not necessarily trace their origin to IEP. This essay also analyzes Muslim environmental activism today by focusing on how its proponents are inspired by modern environmentalism while grounding their activism in IEP. Despite substantial variance and occasional tension, the author argues that both modern environmentalism and IEP can form an ontological alliance, an alliance that is of paramount importance to addressing environmental problems that transcend physical and cultural borders.