 What response (or combination of responses) one thinks to be the least bad here will depend on one’s overall theory of justice. Sufficientarians, for example, may think that the affluent—those above the specified sufficiency threshold—should take on more than their fair share of burdens, but will reject the idea that any of the world’s poorest should be required to adopt  response (1)  (unless perhaps it is absolutely necessary for very large numbers of future people to enjoy what they are entitled to).