In addressing mounting environmental problems in recent years, many Iranian environmentalists have increasingly adapted discourses and implemented programs that are modeled on scientific ecology. Does this mean the verbatim transfer of Western scientific modernity in Iran? My analyses suggest otherwise. This article explores the unique ways in which a burgeoning environmental awareness unfolds in Iranian contexts by investigating how conceptions of "nature" shape the environmentalists' discourses and practices. It appears that an ecological scientific conception of nature is becoming an important frame of reference among such environmentalists. However, another conception of nature-one framed in relation to Iranian nationhood-makes a key contribution to environmentalism in Iran. Drawing on fieldwork conducted in 2009-2011 in Tehran, this study demonstrates how "Iranian nature" is delineated and practiced through the environmentalists' (re)engagements with certain objects-maps, posters, and photographs-in relation to which local ways of conceptualizing nature are elaborated.