Later in this article (Sections 7 and 8) I present an outline of thisworkwhen seen through one particular lens, namely reproductive and environmental externalities, laying stress on the arguments that have shaped it and on the policy recommendations that have emerged from it. The framework I develop focuses on the vast numbers of small, rural communities in the poorest regions of the world and identifies circumstances in which population growth, poverty, and resource degradation can be expected to feed on one another, cumulatively, over periods of time. What bears stressing is that the account does not regard any of the three to be the prior cause.