“…Jonsson, Sarri, Alerby, 2012;Reinfried, 2009;Setha, Mund, 2008;Corney, 2006;van der Schee, 2003;Houtsonen, 2002;Haubrich, 2000). Along these lines, the concepts of SD and ESD have been discussed in relation to different players of the teaching-learning process (Yasar, Seremet, 2009;McKeown, Hopkins, 2007) from primary to university education (Jonsson et al, 2012;Bowers, 2002), as well as in different forms of education (Ramos Trejo, Sánchez Crispín, 2009;Ruiz-Mallén, Barraza, Bodenhorn, Reyes-García, 2009). Along these lines, Corney (2006) has identified two main trends of conceptualizing SD when he observes, on the one hand, an increasing acceptance and consensus for the trinity model (Gough, 2002;Luke, 2001;Morgan, 2000;Huckle, Sterling, 1996) and, on the other hand, the urge to find opposing conceptual approaches to SD (Sauve, 2002;Scott, 1999).…”