Back-casting scenarios constitute a relatively new methodology in the field of sustainability and climate change. Despite its appearance and theorization in the decade of the ´70s, it is only recently that it has become widely used as an instrument in helping decision-making processes in policy-making. The back-casting scenarios methodology appeared in response to the discontent with the traditional methods of trend extrapolation in energy forecasting, where it was assumed that energy demand would increase gradually and renewable energy technologies and energy conservation efforts were ignored (Vergragt & Quist, 2011).In future and sustainability studies, back-casting scenarios are defined as a methodology that allows us to envision and analyze different types of sustainable futures and develop agendas, strategies and pathways to reach them (Vergragt & Quist, 2011). It has a strong normative component, as it starts from desirable future states or set of objectives and then analyzes the steps and policies that are needed to get there, in order to be able to design agendas that can be implemented and that normally require cooperation and communication among different types of actors in complex socio-economic and political environments. It is considered a useful qualitative tool in going toward alternative futures in issues of climate change (Giddens, 2009).The present paper will present the results obtained from applying the methodology of back-casting scenarios to the study of sustainable objectives and pathways to reach them in the case of universities. It will present results obtained at the University of Corunna, by using a process-oriented scenario-development method which combined stakeholder and researcher input to generate images of the future and desired end-states. We will discuss the pros and cons of the method of back-casting scenarios, its uses in studying (un)sustainable practices in large scale organizations and the implications for future research and policy development in public organizations.