1. COM (2006) Commission of the European Communities, green paper – a European strategy for sustainable, competitive and secure energy. 105 final. http://www.energy.eu/directives/2006_03_08_gp_document_en.pdf . Accessed 20 Apr 2009
2. Earth Charter (2000) The Earth Charter. http://www.earthcharterinaction.org/content/pages/The-Earth-Charter.html . Accessed 16 Sep 2006
3. Glasser H (2004) Learning our way to a sustainable and desirable world: ideas inspired by Arne Naess and deep ecology. In: Corcoran PB, Wals AEJ (eds) Higher education and the challenge of sustainability. Kluwer, Dordrecht, pp 131–148
4. Goncz E, Wardencky W, Namiesnik J (2005) Universities and their role in enhancing human and social capital for sustainability. In: Proceedings of committing universities to sustainable development, Technical University, Graz, pp 90–106
5. Hodgson M (1982) Making more out of less. Chem Eng 1982:163–166