The focus of Jennifer Gabrys's Program Earth: Environmental Sensing Technology and the Making of a Computational Planet is "the becoming environmental of computation" (p. 4) understood as the growth of "a distributed and embedded range of monitoring technologies that inform how environments are sensed and managed (p. 3). Although based on wide-ranging research carried out over the past decade, it is not a detailed empirical study; instead, it deploys a number of well-chosen examples in pursuit of more abstract ends.