Ethics in managing climate change most often involves two issues that are tightly connected. The first involves considerations about the just distribution of entitlements and burdens, and the second concerns the fair differentiation of responsibilities. The chapter explains the most important ethical implications of international climate politics and shows why justice plays a key role in all areas of climate policy. Furthermore, it introduces the main domains of climate justice: historical, global, and intergenerational justice. Depending on the policy area at issue, different combinations of principles of climate justice seem most appropriate. The chapter concludes by showing that the differentiation of responsibilities depends not only on which principles of justice are employed but also on the particular climate policy area and level that are at issue.