Climate change is one of the most urgent global problems that we face today. The causes are well understood and many solutions have been proposed; however, so far none have been successful. Ingmar Persson and Julian Savulescu have argued that this is because our moral psychology is ill-equipped to deal with global problems such as this. They propose that in order to successfully mitigate climate change we should morally enhance ourselves. In this chapter we look at their proposal to see whether moral enhancement is indeed a viable solution to the climate crisis, and conclude that due to various theoretical and practical problems it most likely is not.

In certain corners of the moral enhancement debate, it has been suggested we ought to consider the prospect of supplementing conventional methods of enhancing sexual fidelity (e.g. relationship counselling, moral education, self-betterment, etc.) with biochemical fidelity enhancement methods. In surveying this argument, I begin from the conviction that generally-speaking moral enhancement ought to expectably attenuate (or at least not exacerbate) vulnerability. Assuming conventional methods of enhancing sexual fidelity are at least partially effective in this respect – e.g., that relationship counselling sometimes successfully attenuates the particular vulnerability victims of infidelity feel – then presumably the case for supplementing conventional methods with biochemical methods turns, in part, on the claim that doing so will better promote attenuation of victim vulnerability.

In this chapter I argue that on a sufficiently sophisticated conception of what this vulnerability consists in, biochemical methods of enhancing fidelity will not expectably attenuate victims’ vulnerability. Moreover, when combined with conventional methods, biochemical methods will predictably tend to undermine whatever attenuation conventional methods expectably promote in that respect. Thus, I conclude that couples committed to saving their relationship following an instance of sexual infidelity have reason to prefer conventional methods of enhancing sexual fidelity sans biochemical methods to conventional methods plus biochemical methods.

The moral enhancement (or bioenhancement) debate seems stuck in a dilemma. On the one hand, the more radical proposals, while certainly novel and interesting, seem unlikely to be feasible in practice, or if technically feasible then most likely imprudent. But on the other hand, the more sensible proposals – sensible in the sense of being both practically achievable and more plausibly ethically justifiable – can be rather hard to distinguish from both traditional forms of moral enhancement, such as non-drug-mediated social or moral education, and non-moral forms of bioenhancement, such as smart-drug style cognitive enhancement. In this essay, I argue that bioethicists have paid insufficient attention to an alternative form of moral bioenhancement – or at least a likely candidate – that falls somewhere between these two extremes, namely the (appropriately qualified) use of certain psychedelic drugs.