The 6Green project aims to conceive, design, and realize an innovative service-based and holistic ecosystem, able to extend “the communication infrastructure into a sustainable, interconnected, greener end-to-end intercompute system” and promote energy efficiency across the whole 5/6G value-chain. The ultimate objective is to enable and to foster 5/6G networks and vertical applications reducing their carbon footprint by a factor of 10 or more. To achieve this objective, the project will exploit and extend state-of-the-art cloud-native technologies and the B5G Service-Based Architecture with new cross-domain enablers. 6Green will provide stakeholders with flexible and green Artificial Intelligence mechanisms that will allow propagating the environment impact to any players acting on virtual domains, and triggering zero-touch operations according to customizable energy- and carbon-aware policies, allowing to optimally use renewable energy sources. The project will deliver three future-proof use-case applications that will provide a diverse awareness of the green capabilities of the 6Green platform.