A central question in debates about climate justice concerns how the global emissions sink should be shared among the global population over time. This paper considers how global egalitarians should answer that question. In particular, it defends emissions egalitarianism from a view known as ‘integrationism’, according to which shares of the emissions sink should follow from a more general egalitarian theory of distributive justice. First, I show that emissions egalitarianism can draw on a source of functional support not adequately acknowledged (...) in the integrationist critique: it can express an underlying account of the structure of historical responsibility for climate change I call the Fair Share View. Second, I claim that integrationism is also in tension with other principles of responsibility for climate change, and that its scepticism about historical responsibility has not been appreciated. Finally, I provide an alternative to integrationism. My central claim is that integrationism posits too direct a relation between a theory of equality of wellbeing and practical questions about claims to the emissions sink. Egalitarians should appeal to a species of derivative principle I call ‘applied principles of global justice’, and emissions egalitarianism could plausibly be endorsed on these grounds. (shrink)