Negative emission technologies (NETs) or the drawdown of atmospheric carbon is increasingly essential to meeting climate targets. Many options (e.g., afforestation) may not however meet the scale of removal and permanence of storage needed. Scientists and engineers are thus turning to new alternatives involving technology bundles using direct air capture of C0 2 and storage. However, the social acceptability of these is presumed unlikely given the sheer complexity of their components, governance arrangements, perceived advantages and disadvantages, and the different moral and value positions at play. This paper explores public perceptions of a proposed system including above sea and potentially more positively viewed components (wind energy to power direct air capture of carbon) alongside deepocean and potentially more negatively perceived components (injection and storage as carbonate rock).Using a representative survey of n = 2120 US and Canadian residents nearest a proposed system pilot, analysis reveals two very different pro les of perceivers, pro and con. Rejection of the system as a whole is driven by concern for storage or below sea components, physical risks (e.g., leakage), and belief that such a system constitutes a moral hazard, enabling continued fossil fuel dependence. Conversely, those who support such a system perceive it as economically, climatically, and ethically bene cial now and for future generations, express a strong sense of climate severity and urgency, and see themselves as responsible for natural systems. We close with cautions as to the social licence for negative emission technologies, and the fragility of hope as these possibilities unfold.