The aim of this article is to shed a broader light on the social identity of the BRICS group of countries (Brazil, Russia, India, China, and South Africa) whose growing economic power is the defining motive of their social construct in international relations. In line with this purpose, the article examines the BRICS nations’ positions concerning the moral aspect and the notion of responsibility for the nexus between climate change and sustainable development. This article argues that their statements and discourse on climate change and sustainable development forge the process of constructing a separate group identity for the BRICS partners. The articulation of moral appraisals and the notion of responsibility in the areas of climate change and sustainable development help the BRICS countries build their self-conception and self-categorization corresponding to their identity as emerging powers, so their actions are accomplished accordingly.