Our reasoned sense of obligations to others can arise from at least three possible sources: cooperation, having caused harm, and effective power to improve suffering. The last source, this chapter argues, is particularly important in considering our obligations to future generations. It draws on a line of reasoning that takes us well beyond contractarian motivations to the idea of the “impartial spectator” as developed by Adam Smith. The interests of future generations come into the story because they are important in our attempt to be impartial spectators. The obligation of power contrasts with the mutual obligations for cooperation at the basic plane of motivational justification. In the context of climate concerns and intergenerational justice, this asymmetry-embracing approach seems to allow an easier entry for understanding our obligations.