[EN]This investigation focuses on the aggregation of infinite utility streams by social welfare functions. We
analyze the possibility of combining Pareto-efficiency and Hammond Equity principles when the
feasible utilities for each generation are [0, 1] and the natural numbers. In the latter case, the Hammond
Equity ethics can be combined with non-trivial specifications of the Pareto postulate, even through
anonymous social welfare functions. As a consequence, any evaluation of infinite utility streams that
verifies a mild specification of the Paretian axiom must exert some interference on the affairs of
particular generations
