With the increasing impact of climate change globally, many nations have announced carbon neutrality goals by mid 21st century. As a leading industrial sector and a key driven force for social and economic progression/transformation, the ICT industry shall be a key contributor for global carbon neutrality and sustainable growth. In 4G and 5G, there have been efforts in making communications system more energy efficient such as minimizing always-on signaling, enable power saving mode, etc. But still, with the exponential growth of data volume, increasing complexity of communication systems, emergence of new services, we see a steady increase in power consumption over generations. As the industry started working on designing the B5G and 6G communications systems, sustainability and energy efficiency need to be considered as one of the foremost goals in system design. This session will gather experts to discuss green communications for B5G/6G. The discussion intents to address two main questions: 1) how to make the communication system itself more energy efficient and sustainable; 2) how can communication system better help the society and other industrials for achieving the global carbon neutrality goal. The session will discuss gaps, challenges and new air interface and network features needed in B5G/6G system to address these two questions. We expect a lively exchange of views as green communication is a very challenging and very important topic. It is hoped that new research and development activities will be stimulated by such discussions.