The current population of the Earth is 8.2 billion. Although scientific calculations are now available that suggest that overpopulation alone would not be a barrier to sustainability if significant global changes were made (for example, in economic and consumption patterns), the sustainability challenges remain complex and require a comprehensive approach.As learning organisations, universities have a key role in promoting environmental and social sustainability through their teaching and research activities, shaping future generations' attitudes. This research aims to analyse Hungarian higher education institutions' sustainability strategies and measures and explore further directions and development opportunities for strengthening universities' sustainability efforts.In the course of the research, I am looking for answers to the following questions: How sustainable are Hungarian universities today? How are they performing in the light of different ranking methodologies? What are the similarities in current strategies, development directions and operations? What sustainability initiatives are Hungarian universities implementing? What good practices can be identified, and what innovative approaches can be taken to improve sustainability? What could be the role of university libraries and university publishing in the rankings?