Abstract
The first debate in this article has to do with the very possibility of intergenerational justice beyond our obligations towards members of other generations while they coexist with us. Here, we ask ourselves whether we owe anything to people who either have died already, or are not yet born. Differences in temporal location mean that people may not exist at the same time — be it only during part of their life — which raises special ethical challenges. It is one thing to decide whether we owe anything to the next generation(s). It is another to define what we owe them. Most standard theories of justice have tried to answer this difficult question. This article focuses on a comparison between a reciprocity-based and an egalitarian account of justice between generations. It then turns, on the one hand, to a brief discussion of alternative theories and, on the other hand, to implementation issues.