“Being a Pragmatist about Planet Earth” pinpoints the profound shift in the Earth Sciences that is brought about by the idea of the Anthropocene, a geohistorical time coined by recognizable and long-lasting physical change on a global scale, which can be traced back to human activity. The yearlong struggle of the scientific community for and against its establishment as a Geological Time Scale highlights the dynamics of scientific knowledge and calls for a philosophical assessment. The Anthropocene addresses a planet, which is significantly shaped by past, present, and future technological development. This physical change is accompanied by a change in perspective, which emphasizes reciprocity and reflexivity as essential characteristics of human existence on planet Earth. Change is the entry point for a philosophical analysis of the Anthropocene’s semantics. An epistemological basis is established that draws on pragmatist ideas by John Dewey. Intention and interaction play a central role in the developed theory of knowledge and trigger questions about the right way to address the findings and react to them—an ethical perspective is required. A pragmatist ethical framework is developed to open up opportunities for a non-universalist moral philosophy in a globalized world that is permeated by technology.