15.02.2017

# Political Papers

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Global Priorities Project (2017): Existential Risk. Diplomacy and Governance

Global Priorities Project (2017): Existential Risk. Diplomacy and Governance.

"Geoengineering technologies like Solar Radiation Management have the potential to mitigate risks from climate change, while at the same time posing risks of their own. The current lack of international norms on acceptable research practices may well be holding back safe exploration of climate engineering options."

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11.02.2017

# New Publications

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Quaas, Martin F.; et al. (2017): Are there reasons against open-ended research into solar radiation management? A model of intergenerational decision-making under uncertainty

Quaas, Martin F.; Quaas, Johannes; Rickels, Wilfried; Boucher, Olivier (2017): Are there reasons against open-ended research into solar radiation management? A model of intergenerational decision-making under uncertainty. In Journal of Environmental Economics and Management. DOI: 10.1016/j.jeem.2017.02.002.

"We propose a stylized model of intergenerational decision making on SRM research, greenhouse-gas abatement and SRM deployment, under uncertainties about (a) the extent of future climate damage and (b) effectiveness and potential harmful side-effects of SRM. Open-ended research may reveal either that SRM effectively reduces climate damage, or that it would cause more harm than benefits. We find that SRM research increases the likelihood of deployment (“slippery slope”), and derive conditions that it decreases abatement effort in expectation (“moral hazard”)."

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09.02.2017

# New Publications

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Reynolds, Jesse (2016): Solar Climate Engineering, Law, and Regulation

Reynolds, Jesse (2016): Solar Climate Engineering, Law, and Regulation. In Roger Brownsword, Eloise Scotford, Karen Yeung (Eds.): The Oxford handbook of the law and regulation of technology. Oxford: Oxford University Press.

"This chapter offers an introduction to solar climate engineering, and explores its potential, risks, and legal and regulatory challenges. It also contextualizes these proposals with respect to other emerging technologies and the broader socio-political milieu. The chapter discusses the contours of existing and potential regulation, particularly at the international level. These aspects include regulatory rationales, diverse characteristics of proposed regulatory regimes, difficulties in defining the regulatory target, and the management of uncertainty through precaution."

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09.02.2017

# New Publications

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Asayama, Shinichiro; et al. (2017): Ambivalent climate of opinions. Tensions and dilemmas in understanding geoengineering experimentation

Asayama, Shinichiro; Sugiyama, Masahiro; Ishii, Atsushi (2017): Ambivalent climate of opinions. Tensions and dilemmas in understanding geoengineering experimentation. In Geoforum 80, pp. 82–92. DOI: 10.1016/j.geoforum.2017.01.012.

"This paper examines how the meanings of geoengineering experimentation, specifically SAI field trials, are reconfigured in the deliberation of the lay public. To this end, we conducted focus groups with Japanese citizens in June 2015 on the geoengineering concept and SAI field trials."

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07.02.2017

# New Publications

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Laakso, Anton; et al. (2017): Radiative and climate effects of stratospheric sulfur geoengineering using seasonally varying injection areas

Laakso, Anton; Korhonen, Hannele; Romakkaniemi, Sami; Kokkola, Harri (2017): Radiative and climate effects of stratospheric sulfur geoengineering using seasonally varying injection areas. In: Atmos. Chem. Phys. Discuss., S. 1–25. DOI: 10.5194/acp-2017-107.

"In this study we employ alternative aerosol injection scenarios to investigate if the resulting radiative forcing can be optimized to be zonally more uniform without decreasing the global efficacy. We used a global aerosol-climate model together with an Earth system model to study the radiative and climate effects of stratospheric sulfur injection scenarios with different injection areas. According to our simulations, varying the SO2 injection area seasonally would result in a similar global mean cooling effect as injecting SO2 to the equator, but with a more uniform zonal distribution of shortwave radiative forcing."

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02.02.2017

# New Publications

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Kärcher, Bernd (2017): Cirrus Clouds and Their Response to Anthropogenic Activities

Kärcher, Bernd (2017): Cirrus Clouds and Their Response to Anthropogenic Activities. In: Curr Clim Change Rep. DOI: 10.1007/s40641-017-0060-3.

"This review assesses recent observational and modeling evidence of how anthropogenic activities might affect cirrus. Changes in physical properties and chemical composition of liquid aerosol particles will unlikely affect cirrus significantly, but anthropogenic influences may occur through changes in heterogeneous ice nuclei."

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20.01.2017

# Media

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Space.com: Geoengineering Earth's Atmosphere: How It Could Affect Astronomy

"Adding particles into the air could have a number of important ramifications, including affecting how well astronomers can view the night sky. According to Lowenthal, some studies have shown that adding clouds to the atmosphere can increase the brightening of the night sky by as much as 25 percent. But that doesn't mean it shouldn't be done."

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16.01.2017

# New Publications

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Gabriel, Corey J.; et al. (2017): The G4Foam Experiment. Global climate impacts of regional ocean albedo modification

Gabriel, Corey J.; Robock, Alan; Xia, Lili; Zambri, Brian; Kravitz, Ben (2017): The G4Foam Experiment. Global climate impacts of regional ocean albedo modification. In: Atmos. Chem. Phys. 17 (1), S. 595–613. DOI: 10.5194/acp-17-595-2017.

"Here we present the results of climate model simulations of a unique Geoengineering Model Intercomparison Project Testbed experiment to investigate the benefits and risks of a scheme that would brighten certain oceanic regions. The National Center for Atmospheric Research CESM CAM4-Chem global climate model was modified to simulate a scheme in which the albedo of the ocean surface is increased over the subtropical ocean gyres in the Southern Hemisphere."

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16.01.2017

# New Publications

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Kravitz, Ben; et al. (2017): Understanding How Climate Engineering Can Offset Climate Change. Sixth Meeting of the Geoengineering Model Intercomparison Project; Oslo, Norway, 21–22 June 2016

Kravitz, Ben; Robock, Alan; Kristjánsson, Jón (2017): Understanding How Climate Engineering Can Offset Climate Change. Sixth Meeting of the Geoengineering Model Intercomparison Project; Oslo, Norway, 21–22 June 2016. In: Eos. DOI: 10.1029/2016EO005279.

"Participants at a meeting in Oslo, Norway, presented new developments in modeling and simulating climate engineering approaches, including stratospheric aerosols, marine cloud brightening, cirrus thinning, and land and ocean brightening."

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12.01.2017

# Media

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Inverse: Solar Engineering Is the Terrible Idea That Just Might Save Us

"Injecting sulfur dioxide by the megaton into the stratosphere is as crazy as it sounds."

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