How can we include the affected interests of future generations and non-humans in deliberations about global justice given that they cannot exercise formative agency themselves? Starting from the role moral imagination plays in moral reasoning, and hence in formative agency concerning the meaning of justice as well, this chapter looks at ways in which deliberations can be enhanced so as to promote inclusion of these neglected interests. Visual and experiential prompts should complement talk-centric deliberative processes. This would expand the deliberators’ moral imagination, enabling them to internalize the interests of future generations, animals, ecosystems, and the Earth system, and reach decisions reflecting all affected interests, even those bound to be silent – though that seeming silence itself may reveal an incapacity to listen. These kinds of considerations can be reflected in institutional design. Currently these frontiers of justice are only weakly present in the Sustainable Development Goals, which look ahead only to 2030, turned down the chance to incorporate planetary boundaries, and say little or nothing about non-humans.