In the complex world of international negotiations, nation-states often navigate a spectrum of political relationships, from alliances and partnerships to competition and rivalry. Despite their diverse backgrounds and interests, the BRICS countries collectively constitute a significant proportion of global greenhouse gas emissions. Drawing upon the principles of neoliberal institutionalism, this study delves into the origins of the BRICS cooperation mechanism and its impact on climate cooperation among its member states. Our analysis traces the climate policies of BRICS nations since the inception of the UNFCCC in 1992, taking into consideration factors such as their level of economic development, environmental vulnerability, and the broader international political context. We argue that these three factors primarily shape the dynamics of alliance and partnership within BRICS regarding climate governance, although underlying competition may also influence collaborative efforts. This study aims to stimulate further theoretical discourse on the formation of political alliances within the context of global climate governance.