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Based on an ethnographic analysis of childfree communities, and on the lexographical processing of Internet posts, this paper analyses the evolution of speech about childlessness in the English-speaking world. Over the past dozen years, environmental fears have progressively emerged as a main concern among the Internet pages and groups that we studied. While childfree communities have been long divided between those who lament their infertility and those who defend a life without children, new “antinatalist” discourses have emerged that place population reduction as a legitimate political aim and/or a valid ethical proposition. Childfree life, seen as neither a curse nor an opportunity, tends to be more frequently associated with an altruistic decision in the face of impending ecological disasters. By describing these discourses, and retracing their evolution and distribution, this paper studies the emergence of new ethical concerns that defend childfree lives as an ecological choice and a new approach to population growth.