Keywords Moral enhancement · Bioenhancement · Climate change · Methodological individualism · Moral education · Anti-behaviorist fallacy "Advances in the cognitive sciences have made neurotechnology imperative… The cognitive sciences are now the critical sciences; they will determine the answer to the ultimate moral question of human survival. Given the urgency of this immediate survival problem, the cognitive and social sciences must enable us to control [our] animalistic, barbaric, and primitive propensities … and subordinate these negatives to the uniquely human moral and ethical characteristics of love, kindness, and empathy. … We can no longer afford to rely solely on the traditional, prescientific attempts to contain human cruelty and destructiveness. The techniques and appeals of religion, moral philosophy, law, and education … are, in themselves, no longer appropriate [in] the present survival urgency. …The work on the effects of direct stimulation of certain areas of the brain, … the effects of certain drugs on exciting, tranquilizing, or depressing the emotional and motivational levels of the individual; … suggest that we might be on the threshold of that type of scientific biochemical intervention which could stabilize and make dominant [our] moral and ethical propensities … and subordinate, if not eliminate, … negative and primitive behavioral tendencies. ….It is possible to object to the era of neurotechnology on 'moral' grounds and to assert that these suggestions are repugnant because they are manipulative and will take away [the] natural right to make errors-even those errors which perpetrate cruelties and destruction upon other human beings. In the light of the realities of and possible consequences of nuclear weaponry, these allegedly moral arguments seem mockingly, pathetically immoral. It Abstract The controversy over moral bioenhancement has fallen into a stalemate between advocates and critics. We wish to overcome this stalemate by addressing some of the key challenges any moral enhancement project has to meet. In particular, we shall argue that current proposals are unpersuasive as they, first, fail to diagnose the often complex causes of contemporary moral maladies and, second, are premised on methodological individualism. Focusing on brains and minds neglects social and environmental factors. Solving the mega-problems of today very likely requires more than transforming individual brains, it requires structural and higher-level changes. By itself, moral bioenhancement is thus insufficient for solving these problems. Moreover, we outline some of the yet unresolved problems of (democratic) legitimacy a mandatory state-run bioenhancement project faces and show why they cannot be defused through analogies with moral education. Finally, normatively less worrisome means of enhancing morality, such as psychotherapies affording self-exploration, are already available. Moral bioenhancement may thus not even be necessary for solving today's mega problems. The overemphasis on speculative future te...