This dissertation explores what explains the convergence among the BRICS, the acronym standing for Brazil, Russia, India, China, and South Africa, on climate change, despite their divergent characteristics in terms of leading production sectors, demographic trends, population size, emissions profiles, and roles in the energy market. Based on the methodological principles of the theory testing branch of process tracing, there are three potential arguments driven by the existing theories to understand the phenomenon at hand. Hence, the dissertation utilizes soft-balancing of Neorealism, functional cooperation of Liberal Institutionalism, and collective identity formation of Constructivism. The main argument contends that the increasing interaction among the BRICS states, changes in the material world, and, as a result, the cohesion on the basis of collective identity have expanded the web of intra-group cooperation and collaboration within the club and generated shared ideas, discourse, and values on climate change-related issues over time. Adopting an interpretive discourse analysis, the dissertation also relies on primary textual materials consisting of the declarations of the BRICS platform, high-ranking state representatives’ speeches and statements, and other official documents. The dissertation unravels how their collective identity position the BRICS as emerging powers between developed and developing countries and urge their active involvement in tackling climate change in connection with their overlapping discursive, ideational, and policy frameworks. Thus, the dissertation contributes to the literature by unveiling the roots of the convergence among the BRICS, extending the timeframe for uncovering the shared BRICS positions, and marking the relevance of collective identity formation for BRICS cooperation.