Contributions to this edited volume examine COP21 as an arena where new framings of global problems, approaches to global governance and actor coalitions are tried and tested; framings, approaches and coalitions whose effects transcend the climate arena. Climate conferences take up an ever-growing number of issues, from debates about development, energy and forests, to biodiversity, global inequality and urban planning, among others. In return, they attract a growing number of actors from very different backgrounds and who each have their own interpretations of the climate problem, its causes and possible solutions. This points to a broader two-way shift in the global climate debate. On the one hand, we are witnessing a globalisation of the climate problem through the inclusion of new issues and actors into the climate regime. This globalisation is more sectorial than spatial, as it mainly relates to the extension of the climate problem to other domains (even if this territorial dimension is also important). On the other hand, a climatisation of the world can be observed, whereby actors present particular issues that were formerly unrelated to the climate regime through a ‘climatic lens’. This leads to the alignment of different topics on the climate problem, and to their treatment according to the dominant logics and practices of the climate regime.