Axel Gosseries’s What is Intergenerational Justice? (2023) is a splendid book.  It provides an introduction to the topic of intergenerational justice that is accessible and an excellent guide to someone unfamiliar with the issues.  At the same time it has much of interest to those who are well versed in these debates.  It has rich and illuminating discussions of, among other things, what principles of justice should govern how people treat future generations, environmental sustainability, climate change, and the implications of our impacts on future people for ideals of democratic legitimacy and normative theorizing about institutional design.   In this article I want to focus on Gosseries’s analysis of climate change.  His chapter on climate justice is rich and nuanced and covers a considerable amount of ground.  I shall focus on one issue in particular.  One key feature of climate change is that the problem has, in part, been caused by the actions of previous generations.  Human beings emitted very low quantities of greenhouse gases for centuries.  However, from the 19th century onwards emissions of greenhouse gases started to rise and increased dramatically throughout the 20th century and the first decades of this century.  One question that arises is: When we are considering what duties current generations have to mitigate climate change, what normative significance should we attach to the climate-endangering activities of people in the past?  Should those alive now pay for the ways in which past members of their country have harmed the climate system?  Many climate campaigners appeal to an idea of historical responsibility.  Are they right to do so?  In this article I shall analyse Gosseries’s discussion of these questions.