Abstract
Current ecological threats, such as the sixth mass extinction or climate change, highlight the need to evaluate the moral implications of changing populations, both human and non-human. The paper sketches a non-anthropocentric and multispecies sufficientarian account of population ethics. After discussing several other options for multispecies population ethics, the paper proposes a two-level account of multispecies sufficientarianism, according to which the value of populations depend on two kinds of sufficientarian thresholds. First, there is a species-relativized individual-level threshold for what species-specific flourishing is for an organism. Second, there is a population-level threshold for a sufficiently viable population enough to support the species-specific flourishing of the current and future members of that population. The paper concludes by discussing some of the practical implications and concerns raised by the two-level account suggested.
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