Faced with climate change and other ecological crises, sustainability has become an inescapable normative framework for organizations and societies worldwide. However, it conceals very different practices and imaginaries of a sustainable future. Firstly, this article introduces the three imaginaries of modernization, transformation, and control and explores what chances of implementation these trajectories have. Modernization is the dominant path driven by governments and corporations, transformation efforts by civil society actors are marginalized, and control is currently becoming more influential as a trajectory in the wake of a renaissance of strong nation-states. Secondly, this article works out the idea that sustainability, in the sense of an open future, is no longer achievable. Too many ecological burdens already exist, or can no longer be averted, so much so that one should be speaking instead about the politics of post-sustainability. It is highly probable that catastrophes and social collapses can no longer be prevented, and a rapid decarbonization of economies and societies in the coming years is so unlikely that the question thus arises as to how positive visions of the future for living together can still be derived from this. Finally, using the example of the rights of nature, it is discussed how there can, nevertheless, be forms of conviviality that could (albeit slowly) grow out of the multiple social and ecological crises and which are based on an amalgam of modernization, transformation, and control.