Suppose philosophers succeeded in putting forward two equally desirable theories of intergenerational justice. Both of them fare extremely well in regard to either a case-implication critique or a prior-principle strategy of argumentation (with the former requiring us to check the implications of a principle in counterfactual cases, and the latter testing the compatibility of a principle with certain more fundamental values, according to Sen [197]). How are we to decide between them? To the extent that we believe that one of the purposes of political philosophy is to issue achievable and desirable recommendations (Stemplowska 319) or to be action-guiding (Swift 363), we might compare the two by applying a feasibility criterion. Such a criterion indicates that a state of affairs could be realized “if we were to summon sufficient practical will and direct our (individual or collective) efforts in the right direction” (Gheaus 450)....

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