In this paper the authors briefly present what their theoretical reflections and empirical research has yielded in respect to citizenship education and religious education. The theoretical as well as political and practical questions of the relationship of global citizenship and worldview education are scrutinized. The main focus is on the issue whether there is or could be a connection between the concepts of "worldview education" and "global citizenship education" from the point of view of inclusivity in respect to both concepts. Habermas's distinction between the concepts of democratic state citizenship and global or cosmopolitan citizenship is conceptually helpful. The authors also take into account the question of whether there is a certain educational, political or religious necessity on a national as well as global level to deal with this possible relationship as viewed through the lens of social sustainability.