Sustainable cities and communities are a critical focus area for universities. Many educational institutions are actively involved in research, education, and initiatives related to sustainability in urban environments. Universities contribute to sustainable cities and communities through research, sustainable campus initiatives, education and training, community engagement, innovation hubs, policy advocacy, demonstrating sustainable technologies and hosting conferences and events. 

General Sir John Kotelawala Defence University (KDU) conducts extensive research on various aspects of sustainability, including urban planning, transportation, energy efficiency, and environmental conservation. This includes policies and practices that can lead to more sustainable cities. KDU often implement sustainability initiatives serving as role models for sustainable practices. These initiatives can include energy-efficient buildings, waste reduction programs, and sustainable transportation options. It also offers degree programs, courses, and workshops focused on sustainability and urban development. These educational opportunities help train the next generation of professionals who can work towards creating more sustainable cities. KDU engages with local communities to address sustainability challenges. This can involve partnerships, outreach programs, and collaborative projects that benefit both the university and the surrounding community. 

The university serves as an innovation hub and a research centre dedicated to sustainable urban development. It facilitates interdisciplinary research and collaboration with government agencies and businesses. It also advocates for sustainable policies at local, national, and international levels. They contribute to shaping regulations and guidelines that promote sustainability in cities and communities. KDU promotes new sustainable technologies and practices, showcasing what is possible in terms of renewable energy, green infrastructure, and sustainable transportation. Moreover, it hosts conferences, seminars, and events related to sustainability, bringing together experts, policymakers, and community members to share knowledge and best practices. Overall, KDU plays a vital role in advancing the sustainability agenda in cities and communities through research, education, and practical initiatives.