The history of the axiomatic approach to the ranking of infinite streams starts with Koopmans' (1960) characterization of the discounted utilitarian rule. This rule, however, meets Chichilnisky's axiom of dictatorship of the present and puts future generations offside. Recently, Lauwers (2010a) and Zame (2007) have uncovered the impossibility to combine in a constructible way the requirements of equal treatment, sensitivity, and completeness. This contribution presents and discusses different axioms proposed to guide the ranking of infinite streams and the criteria they imply. The literature covered in this overview definitely points towards a set of meaningful alternatives to discounted utilitarianism. JEL Classification Number: D71, D81. 1 In his review on intergenerational equity, Asheim (2010, section 3.2) coins this result as the Lauwers-Zame impossibility theorem. 2 I want to mention already here that the combination of continuity with respect to the sup-topology and representability does not guarantee that the ranking rule is constructible. The other way around, the representation of a non-constructible ordering, is in itself a non-constructible object.