“Don’t Stop Thinking About Tomorrow: Two Paradoxes About Duties to Future  Generations,” Philosophy and
  Public Affairs  Vol. 25, No. 4 (Fall 1996), pp. 267-307.

  Defends Derek Parfit’s Mere Addition Paradox from a variety of previous attempts to solve it, identifies a new paradox
  that is parallel to Parfit’s, argues that it is this second paradox that captures the moral problem Parfit set out to identify, and
  demonstrates that this second paradox is capable of resolution.