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Konrad Ott and Frederike Neuber

The means to combat dangerous anthropogenic climate change constitutes a portfolio. Beside abatement of greenhouse gas emissions, this portfolio entails adaptation to changing climate conditions, and so-called climate engineering measures. The overall portfolio has to be judged on technical, economic, and moral grounds. This requires an in-depth understanding of the moral aspects of climate engineering options. Climate engineering (CE) is a large-scale intentional intervention either in carbon cycles (carbon dioxide removal; CDR) or in solar radiation (solar radiation management; SRM). The ethical discourse on climate engineering has gained momentum since the 2010s. The set of arguments pro and contra specific CE technologies constitute a vast landscape of discourse. Single arguments must be analyzed with scrutiny according to their ethical background, their normative premises, their inferential logic, and their practical and political consequences. CE ethics, then, has a threefold task: (a) it must suppose a solid understanding of different CE technologies and their risks; (b) it has to analyze the moral arguments that speak in favor or against specific CE technologies; and (c) it has to assess the impacts of accepting or rejecting specific arguments for the overall climate portfolio’s design. The global climate portfolio differs from ordinary investment portfolios since stakes are huge, moral values in dispute, risks and uncertainties pervasive, and collective decision-making urgent. Any argument has implications of how to design the overall portfolio best. From an ethical perspective, however, one must reflect upon the premises and inferential structures of the arguments as such. Analysis of arguments and mapping them logically can be seen as core business of CE ethics. Highly general arguments about CE usually fall short, since the diverse features of individual technologies may not be addressed by overarching arguments that necessarily homogenize different technologies. It can be stated with confidence that the moral profiles of CDR and SRM are highly different. Every single deployment scheme ought to be judged specifically, for it is a huge difference to propose SRM as a substitute for abatement, or to embed it within a comprehensive climate portfolio including abatement and adaptation, where SRM will be used sporadically and only for a matter of decades.


Daniel Barben and Nils Matzner

“Anticipatory governance” has gained recognition as an approach dedicated to shaping research and development early on, that is, long before technological applications become available or societal impacts visible. It combines future-oriented technology assessment, interdisciplinary knowledge integration, and public engagement. This article places debates about the anticipatory governance of climate engineering (CE) into the context of earlier efforts to render the governance of science, emerging technologies, and society more forward-looking, inclusive, and deliberative. While each field of science and technology raises specific governance challenges—which may also differ across time and space—climate engineering seems rather unique because it relates to what many consider the most significant global challenge: climate change. The article discusses how and why CE has become subject to change in the aftermath of the Paris Agreement of 2015, leading to a more open and more fragmented situation. In the beginning, CE served as an umbrella term covering a broad range of approaches which differ in terms of risks, opportunities, and uncertainties. After Paris, carbon dioxide removal has been normalized as an approach that expands mitigation options and, thus, should no longer be attributed to CE, while solar radiation management has remained marginalized as a CE approach. The 1.5 °C special report by the Intergovernmental Panel on Climate Change is indicative for this shift. The governance of CE unfolds in a context where the assessment of climate change and its impacts provides the context for assessing the potentials and limitations of CE. Since one cannot clearly predict the future as it is nonlinear and multiple anticipation may mark a promising way of thinking about future realities in the contemporary. Due to its indeterminacy the future may also become subject to “politics of anticipation.” As uncertainty underlies not only ways of thinking the future but also ways of acting upon it, anticipatory governance may provide valuable guidance on how to approach challenging presents and futures in a reflexive way. In consequence, anticipatory governance is not only aware of risks, uncertainties, and forms of ignorance but is also ready to adjust and realign positions, following the changing knowledge and preferences in the worlds of science, policymaking and politics, or civil society. This article will discuss notions of anticipatory governance as developed in various institutional contexts concerned with assessing, funding, regulating, or conducting research and innovation. It will explore how notions of anticipatory governance have been transferred to the field of CE, in attempts at either shaping the course of CE-related research and innovation or at critically observing various CE-related governance endeavors by evaluating their capacities in anticipatorily governing research and technology development. By working in a double epistemic status, “anticipatory governance” exhibits useful characteristics in both practical and analytical ways. Considering the particular significance of climate change, approaches to anticipatory governance of CE need to be scaled up and reframed, from guiding research and innovation to meeting a global challenge, from creating capable ensembles in research and innovation to facilitating societal transformation toward carbon neutrality.


S.C. Pryor and A.N. Hahmann

Winds within the atmospheric boundary layer (i.e., near to Earth’s surface) vary across a range of scales from a few meters and sub-second timescales (i.e., the scales of turbulent motions) to extremely large and long-period phenomena (i.e., the primary circulation patterns of the global atmosphere). Winds redistribute momentum and heat, and short- and long-term predictions of wind characteristics have applications to a number of socioeconomic sectors (e.g., engineering infrastructure). Despite its importance, atmospheric flow (i.e., wind) has been subject to less research within the climate downscaling community than variables such as air temperature and precipitation. However, there is a growing comprehension that wind storms are the single biggest source of “weather-related” insurance losses in Europe and North America in the contemporary climate, and that possible changes in wind regimes and intense wind events as a result of global climate non-stationarity are of importance to a variety of potential climate change feedbacks (e.g., emission of sea spray into the atmosphere), ecological impacts (such as wind throw of trees), and a number of other socioeconomic sectors (e.g., transportation infrastructure and operation, electricity generation and distribution, and structural design codes for buildings). There are a number of specific challenges inherent in downscaling wind including, but not limited to, the fact that it has both magnitude (wind speed) and orientation (wind direction). Further, for most applications, it is necessary to accurately downscale the full probability distribution of values at short timescales (e.g., hourly), including extremes, while the mean wind speed averaged over a month or year is of little utility. Dynamical, statistical, and hybrid approaches have been developed to downscale different aspects of the wind climate, but have large uncertainties in terms of high-impact aspects of the wind (e.g., extreme wind speeds and gusts). The wind energy industry is a key application for right-scaled wind parameters and has been a major driver of new techniques to increase fidelity. Many opportunities remain to refine existing downscaling methods, to develop new approaches to improve the skill with which the spatiotemporal scales of wind variability are represented, and for new approaches to evaluate skill in the context of wind climates.