Starting with the view that the emergence of citizen science initiatives proves the fullest potential to address environmental problems and promote sustainability from the ground up, this conceptual paper aims to explore why citizen science matters for a low-carbon future in the Mekong region. Based on a literature review and semi-structured expert interviews, this paper highlights the importance and unique impacts of citizen science in science, policy, and sustainability education spheres. These impacts are reflected in case studies of United States and Belgium...