This paper presents a multi-sited ethnographic study of degrowth activism in France and Quebec that demonstrates how the researcher, who is both localized and positioned, constructed the study. The field of study, defined as an interknowledge network rather than a delimited space, is described in its spatial dimension through the concept of mobility. The socially situated nature of the ethnographic approach is explained by examining the effects of labeling and the role of secondary socializations in how we maintain ourselves within our field of investigation. Finally, the author shows how a multi-sited ethnography based on a microscopic approach constitutes a heuristic method for studying the multi-scalar activities of degrowth activists.