The fifth generation (5G) of wireless communication technology is poised to revolutionize the way we connect and communicate with each other as well as with our devices and machines. This new book explores the intersection of 5G technology and environmentally sustainable communication networks in the context of smart cities. It delves into the technical, social, and environmental aspects of 5G networks, highlighting their potential to drive eco-friendly urban development. Starting with an overview of 5G technology and its potential environmental impact, the book discusses energy-efficient design and management of 5G networks and devices and the role of renewable energy sources in powering these networks. It looks into diverse issues related to 5G networks, including issues related to antenna, edge computing, M2M communication, 5G in healthcare systems, use of blockchain technology, edge computing, and how 5G networks can be leveraged to promote more sustainable and improved outcomes. Relevant case studies and best practices are presented from around the world, highlighting examples of 5G green communication networks for smart cities.