This book launches a new mode of philosophical and ethical reflection with respect to the challenges posed by the degradation of the natural environment. While the work of French philosopher Jacques Derrida (1930–2004), with its relentless interrogation of the anthropocentric metaphysics of presence, has already proven highly influential in posthumanism and animal studies, the present volume builds on these insights in addressing the most pressing environmental issues of our time. The volume brings together fifteen scholars from a wide variety of related fields, including eco-phenomenology, eco-hermeneutics, new materialism, posthumanism, animal studies, science and technology studies, environmental humanities, eco-criticism, earth art, and analytic environmental ethics. Overall, eco-deconstruction offers an account of differential relationality explored in an ecological context, both quasi-ontologically and quasi-normatively, with attention to diagnosing our times. Accordingly, the book is divided into four sections—Diagnosing the Present, which suggests that our times are marked by a flattened-out understanding of time and thus in need of deconstructive dispositions; Ecologies, which mobilizes the spectral ontology of deconstruction to argue for the constitutive ecological embeddedness of mortal life; Nuclear and Other Biodegradabilities, in which contributors reflect on the remains and by-products of human culture, including nuclear waste and species extinctions; and Environmental Ethics, which uncovers a demand for justice that emerges as a response to original differentiation and the mortality and alterity it installs in living beings. As such, the book may resonate with readers not only in philosophy, but across the humanities and the social and natural sciences.