The aim of this project is twofold: first, I attempt to address what justice demands in the face of climate change. The approach that I take to working through this question is explicitly Rawlsian in character; that is, the arguments that I employ all draw upon the work of John Rawls. Thus, the second aim of this project is to defend the ability of Rawls?s work to deal with the problem of climate change (and generally complex environmental problems like climate change). This work is accomplished in four chapters. In the first chapter I defend Rawls?s Law of Peoples as a reasonable starting point, showing that this work is a viable conception of what justice demands in the international realm. In the second chapter, I work out the basic responses and tools of Rawls?s theory to the problem of climate change, focusing on the connected ideas of well-orderedness and the duty of assistance. In chapter 3, I address the problem of historical emissions. I argue for a conception of rectification that coheres with and is based on the Rawlsian framework. Finally, in chapter 4 I explore how to consider the interests of future generations. In this chapter, I use as a starting point the pure intergenerational problem (PIP) as detailed by Stephen Gardiner. I here argue that the just savings principle and the accompanying tools of the original position and the veil of ignorance together provide a way out of the PIP.Thus I show that Rawls?s theory is capable of dictating a coherent and robust response to the problem of global change. And as such, Rawls?s theory offers a new and well-defended approach to thinking through the problem of global climate change. In sum, it answers the question: How does justice demand that we act in the face of global climate change?