Sustainability is no longer a side issue. It's a core requirement for modern media planning. Whether it's data minimization, CO2 reduction, or a holistic evaluation of media partners based on environmental, social, and governance criteria, the Mediaplus Sustainability Initiative brings together projects that show how responsibility and performance can go hand in hand. Two developments have shaped the industry in particular: GreenGRP, one of the first open platforms for offsetting the CO₂ emissions of advertising campaigns, made significant contributions to the assessment and offsetting of campaign carbon footprints. The Responsible Media Index (RMI) followed with a rating system that, for the first time, allows for an objective ESG classification of the German media landscape. Both initiatives remain key reference points for sustainable media work in Germany today. The cases below show how sustainability has been put into practice on real Mediaplus client projects.