I suggest that the Kantian categorical imperative can be a basis for an ethical duty to live sustainably. The universalizability formulation of the categorical imperative should be seen as a test of whether the principle underlying a way of life is self-destructive of the system of living and acting which makes the way of life possible. In exploring this interpretation the self should be conceptualized as a socially and system-constituted being, rather than an atomized will. In this sense, a self (...) which lives in a way that is destructive of the system of life, is also in principle willing its own self-destruction. (shrink)