What do we owe future generations? Everyone who is alive, has rights. And governments have obligations to their citizens. But what about people who are not yet born? Should their interests be taken into account - even though they don’t yet exist? David Edmonds draws upon the thinking of the late philosopher Derek Parfit to address this vexing question, which has consequences for real-world policy now in areas such as climate change. Presenter: David Edmonds Producer: Nathan Gower Editor: Hugh Levinson