T​his book contains selected papers presented during the World Renewable Energy Network biannual World Med Green Forum (MGF). The 2022 MGF highlights the role of renewable energy applications in the sustainable building sector with a focus on the Mediterranean region as a foundation for a truly positive energy future. MGF is an open roundtable for an international community of researchers, practitioners, and experts to discuss the most innovative and promising sustainable building technologies. The papers presented explore the intersection between twin transitions in policies, programs, projects, and experimentation, with the digital domain innovating the green building sector towards more reliable and inclusive planning and design practices in order to collectively envision future buildings and cities.