Based on mixed-methods research and ethnographic fieldwork at various sites in Italy, this book examines the relationship between expertise and activism in grassroots environmentalism. Presenting interviews with citizens, activists and experts, it considers activism surrounding infrastructure in urban areas, in connection with water management, transport, tour- ism and waste disposal. Through comparisons between different political environments, the author analyses the ways in which citizens, political activists and technical experts participate in using expertise, shedding light on the effects of this on the structure and composition of social movements, as well as the implications for the mechanisms of participation and the formation of a...