The research and practice of global citizenship education have thrived since 1990s, but the effectiveness of global citizenship education is limited. The researcher cannot avoid the problematic premise of the possibility of global citizenship education. The identity predicament of global citizen and alienation of local implementing make probability of the global citizenship education problematic. The practical predicament of the global citizenship education manifests that the nation state is the key factor of policy implementation. Environmental question, which is about global common good, attracts the attention from the government of most of nations, and becomes the good case for exploring the feasibility of global citizenship education. Environmental politics explain the inequality and injustice in the globally environmental governance which made the global citizenship education critical. The critical ecopedagogy becomes the new form of global citizenship. The practice of the global citizenship education becomes viable by hybrid activism generated by dialectical movement between local and global in the limit of nation-state.