Sport organizations and events are increasingly held accountable for their climate impacts, particularly those tied to energy consumption, supply chains, and fan travel—categorized as Scope 1, 2, and 3 emissions. To quantify and manage these emissions, SustainSport is developing models and tools grounded in carbon accounting theory, life cycle assessment (LCA), and organizational sustainability frameworks. Using mixed-methods research—including scenario analysis, geospatial data modeling, and primary data collection—we contribute to emissions baselining, hotspot identification, and mitigation planning. These efforts support sport organizations in setting and achieving science-based targets while enhancing their sustainability reporting and improving customer experiences.