ever, come into existence? Few of us believe that we can wrong those whom we leave out of existence altogether?that is, merely possible persons. We may think as well that the directive to be “fruitful, and multiply, and replenish the earth” 1 does not hold up to close scrutiny. How can it be wrong to decline to bring ever more people into existence? At the same time, we think we are clearly ob- gated to treat future persons?persons who don’t yet but will exist?in accordance with certain stringent standards. Bringing a person into an existence that is truly awful?not worth having?can be wrong, and so can bringing a person into an existence that is worth having when we had the alternative of bringing that same person into an existence that is substantially better. We may think as well that our obligations with respect to future persons are triggered well before the point at which those persons commence their existence. We think it would be wrong, for example, to choose today to turn the Earth of the future into a miserable place even if the victims of that choice do not yet exist.

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