Taking up the introductory thought experiment of the time traveller from 2100, this final chapter summarises the main findings of the book. It revisits the systemic positioning of the concept between two manifestations of intergenerational equity: the general manifestation and the specific doctrine. Building on this, the different findings on the legal nature of the concept are reminded—with the general conception having normative capacity and legal effect on the one hand, and the specific doctrine still constituting an emerging non-binding norm of international environmental law. In summarising the book’s findings on several structural questions, the chapter turns to the emerging developments on duty-bearers and right-holders of intergenerational equity as well as the frameworks of implementation and representation. Eventually, the concluding chapter revisits the present generation’s hypothetical answers to the time traveller regarding the temporally applicable legal regime—building on the modified doctrine of intertemporal law elaborated in Chaps. 6 and 7 . The chapter ends with an outlook on further open research questions resulting from the book’s findings.