At the beginning of a new decade, we suggest to look at the longer-term. Let’s consider the world of multilateralism two decade from now, i.e. well beyond the timeline of the 2030 Agenda. The setting in 2040 is likely to differ substantially from today. Things change, and the job of scenario-building is to imagine different futures without merely projecting existing trends or historic examples. Scenario-Building also provides us with ideas about what we need to do to land in the space we see as most preferable.