This article casts light on the moral implications of the possibility of human extinction, with a specific focus on extinction caused by an interruption in human reproduction. In the first two paragraphs, I show that moral philosophy has not yet given promising explanations for the wrongness of this kind of extinction. Specifically, the second paragraph contains a detailed rejection of John Leslie’s main claims on the morality of extinction. In the third paragraph, I offer a demonstration of the fact that (...) a moral view which stresses the permissibility of some types of human extinction can be effectively constructed, while in the following paragraph I propose a prima facie defense of a new approach to the topic which is likely to provide us with reasons in favor of the wrongness of a premature departure of humankind. (shrink)

Because the poorest people tend to die from easily preventable diseases, addressing poverty is a relatively cheap way to save lives. War, by contrast, is extremely expensive. This article argues that, since states that wage war could alleviate poverty instead, poverty can render war unjust. Two just war theory conditions prove relevant: proportionality and last resort. Proportionality requires that war does not yield excessive costs in relation to the benefits. Standardly, just war theorists count only the direct costs: the death (...) and destruction wrought by war. This article argues that it can sometimes be appropriate to add the opportunity costs of a failure to alleviate poverty. Last resort is the condition that there must be no better alternative means of achieving the same just end for which the war is waged. This article argues that there are some cases in which alleviating poverty may constitute a better alternative. These are cases in which the most fitting description of the just end for war is sufficiently general that poverty alleviation offers a means to pursue it. The idea that poverty can sometimes render war unjust has, to date, been largely overlooked. It is, nevertheless, an idea with profound implications since, once taken seriously, war becomes much harder to justify. Wars that, in every other respect, seem just may prove disproportionate or unnecessary given the alternative of alleviating poverty. (shrink)

Discounting future costs and benefits is often defended on the ground that our descendants will be richer. Simply to treat the future as better off, however, is to commit an ecological fallacy. Even if our descendants are better off when we average across climate change scenarios, this cannot justify discounting costs and benefits in possible states of the world in which they are not. Giving due weight to catastrophe scenarios requires energetic action against climate change.