This chapter summarises the chief contributions of the book and discusses weaknesses in the international norms of climate responsibility. It argues that a more balanced, solidarist conceptualisation of the human–nature relationship is necessary to achieve the genuine change required to make international society 'green'. The emergence of the international norm of climate responsibility has spelled profound normative change in international society, in which environmental stewardship has come to constitute a collective responsibility of both states and non-state actors. In line with China's rising international status, many observers have begun to worry whether China will cooperate in line with contemporary international norms and practices created by the United States after World War II. Contemporary problems differ fundamentally from those faced before and after World War II; instead of the balance-of-power security dilemmas characteristic of the Cold War period, today's problems vary from terrorism to financial crises and from environmental degradation and climate change to issues of global health and food security.