6G Sustainability KPI Assessment Introduction and Gap Analysis Sustainable 6G Connectivity A Powerful Means of Doing Good Multi-Sensory Extended Reality (XR) in 6G Terminology for Frequency Ranges Digital World Experiences Cost-EfficientSolutions Trust, Security, and Resilience for 6G Systems 6G Distributed Cloud and Communications Systems 6G Technologies 6G Applications and Use Cases Roadmap to 6G Green G: The Path Toward Sustainable 6G