 There is a third problem with treating emissions as an appropriate distribuendum. The problem is that a dilemma arises when we consider our responsibilities to future generations. There seem to be several options. Option 1 would be to deny that there are duties of justice to future generations to ensure that they too have rights to emit greenhouse gases. Perhaps someone might hold that there are no duties of justice at all to them (1a). Or they might hold that there are but that they do not include leaving them rights to emit (1b). (1a) seems implausible in light of the points made in  Section 3;  and (1b) adopts a discriminatory attitude to future people that stands in need of moral justification.