Jody Cohen and Anne Dalke are two experienced teachers collaboratively creating a book and companion website. Now published by punctum books, the project brings together analytical frameworks from environmental studies with those that attend to the irreducibility and unknowability of the unconscious. Advocating for a form of sustainable pedagogy that flourishes amid diversity and disequilibrium, we are also drawing on stories from our own teaching. The alteration in educational practice that we describe recognizes and responds to the uncontrollable, yet resource-rich, complexities of classroom life, particularly for teaching and learning as social and environmental justice work. Limitlessness, we argue, is a richer way to think about sustainable pedagogy than is seeking new and better boundaries.