We have duties to presently existing persons, but what about future people, people who don’t even exist yet? Do we have moral obligations to tomorrow’s child? What is the moral standing of future persons?
Future people can’t say what their specific interests might be, so we can’t consult them and ask them to contribute to a dialogue with us about how we should balance their concerns with those of presently existing persons. If presently existing persons are in need, but addressing such persons’ needs would have significantly negative consequences for future persons, the problem is to figure out what are moral duties are in such a case.