In the concluding chapter, I look back at the question I began with and the answer I found in the practice of writing. I re-visit accounts of science and politics and describe the three sides to this relationship that I observed in the IPCC. I identify sites within the UNFCCC that have been designed to bring climate science and climate politics closer together, such as in the Global Stocktake of the Paris Agreement. While this brings accountability against the approved knowledge base, it is likely to further increase the political pressure on the IPCC as an organisation and as a practice for writing climate change. From the IPCC’s location in global climate politics, I move inward to the actors, activities and forms of authority that constitute and shape this practice of writing. The book reveals the importance of looking beyond scientific and political forms of authority and describes why the TSUs matter as actors that have the potential to uphold or challenge the scientific order of relations. I explore the implications of science as a site of politics, the global asymmetries in the knowledge economy, and their effects on participation for the design of new intergovernmental assessment bodies, which from the outset must design for meaningful participation by all in these critical sites of agreement-making.