This chapter discusses the current dominant conceptualisation of sustainability and some of its alternatives. Furthermore, it proposes a way in which linguistic research could contribute to new conceptualisations of sustainability. I argue that the impact of ecologically oriented linguistic research on the notion of sustainability (1) could advance new ways of language use and (2) support change towards more sustainable relationships with the ecosphere. I briefly introduce current linguistic scholarship and will limit my scope to a specific area: the role of applied linguistic research—especially functional-, critical- and ecolinguistics—in reconceptualising and changing sustainability-related communication, and, through this, thinking and action. My goal is to broaden the perspectives of applied linguistic studies on sustainability by (1) criticising the current sustainability discourse and outlining new directions by emphasising the need for non-anthropocentric understandings of the concept, (2) presenting a selection of non-anthropocentric approaches to sustainability and (3) advancing ideas related to an ecolinguistic analytic approach of semiotic modes in spatial design and architecture that could reveal further alternatives.