16.10.2019

# New Publications

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Winsberg, E. (2019): A modest defense of geoengineering research

Winsberg, Eric (2019): A modest defense of geoengineering research. [Preprint].

"This paper examines the ethics of geoengineering research--particular research regarding solar radiation management using stratospheric aerosols. It takes a broadly consequentialist approach. The goal is to estimate the expected utility of conducting the research itself."

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11.10.2019

# Media

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Longreads: Holly Jean Buck: It’s Time To Talk About Solar Geoengineering

"We need to start talking about seemingly drastic approaches to the climate crisis, such as sun-dimming aerosols, right now — or we risk losing democratic control of the process."

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30.09.2019

# Media

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Neue Zürcher Zeitung: We led the planet and its stable, mild climate into a new geological epoch: the Anthropocene

German newspaper article about Paul Crutzen and his ozone research.

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17.09.2019

# New Publications

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Halstead, John (2018): Stratospheric aerosol injection research and existential risk

Halstead, John (2018): Stratospheric aerosol injection research and existential risk. In Futures 102, pp. 63–77. DOI: 10.1016/j.futures.2018.03.004.

"This paper discusses whether Stratospheric Aerosol Injection (SAI) should be researched, on the controversial ethical assumption that reducing existential risk is overwhelmingly morally important. On the one hand, SAI could eliminate the environmental existential risks of climate change (arguably around a 1% chance of catastrophe), and reduce the risks of interstate conflict associated with extreme warming."

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22.08.2019

# New Publications

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Visioni, D.; et al. (2019): Seasonal Injection Strategies for Stratospheric Aerosol Geoengineering

Visioni, D.; MacMartin, D.; Kravitz, B.; Tilmes, S.; Mills, M.; Richter, J.; Boudreau, M. (2019): Seasonal Injection Strategies for Stratospheric Aerosol Geoengineering. In: Geophys. Res. Lett. 124 (6), S. 7. DOI: 10.1029/2019GL083680.

"Simulations of stratospheric aerosol geoengineering have typically considered injections at a constant rate over the entire year. [...] We simulated single‐point injections of the same amount of SO2 in each of the four seasons and at five different latitudes (30°S, 15°S, equator, 15°N, and 30°N), 5 km above the tropopause. Our findings suggest that injecting only during one season reduces the amount of SO2 needed to achieve a certain aerosol optical depth, thus potentially reducing some of the side effects of geoengineering. We find, in particular, that injections at 15°N or 15°S in spring of the corresponding hemisphere results in the largest reductions in incoming solar radiation."

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12.08.2019

# New Publications

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Duan, L.; et al. (2019): Climate Response to Pulse Versus Sustained Stratospheric Aerosol Forcing

Duan, L.; Cao, L.; Bala, G.; Caldeira, K. (2019): Climate Response to Pulse Versus Sustained Stratospheric Aerosol Forcing. In: Geophys. Res. Lett., S. 1. DOI: 10.1029/2019GL083701.

"Solar geoengineering has been suggested as a potential means to counteract anthropogenic warming. Major volcanic eruptions have been used as natural analogues to large‐scale deployments of stratospheric aerosol geoengineering, yet difference in climate responses to these forcings remains unclear."

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29.07.2019

# Media

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Forum for Climate Engineering: Researching at the Top of a Slippery Slope?

"Does researching geoengineering—specifically, stratospheric aerosol injection (SAI)—lead us onto a slippery slope, at the bottom of which awaits the deployment of a morally objectionable technology? Should we perhaps abandon research now on account of the possibility that we’ll slide down such a slope? In a recent publication, I argued that we should be cognizant of the possibility for research into SAI to lead to objectionable deployment scenarios."

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08.07.2019

# Media

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BBC Science Focus: Could geoengineering cause a climate war?

"If cutting greenhouse gas emissions isn’t enough, is it time for a plan B? Recent times have seen a surge of interest in geoengineering: China has recently embarked on a substantial research plan, while in the US, Prof David Keith of Harvard University is planning to launch a high-altitude balloon this year to test the feasibility of spraying reflective particles into the stratosphere."

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08.07.2019

# Media

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E&E News: Risks of Controversial Geoengineering Approach “May Be Overstated”

"Some scientists are finding fewer risks related to solar geoengineering than determined in earlier studies, adding emphasis to calls for a global body to monitor proposals that would inject substances into the upper atmosphere to reflect sunlight away from Earth."

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27.05.2019

# Calls & events

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Call for Abstracts: Aerosol Approaches to Climate Engineering. Robert Dickinson Symposium (AMS100)

Deadline: 1. August 2019

"This joint session covers broad topics such as results from climate modeling, using analogs such as volcanic eruptions and ship tracks, and development of technology to actually implement solar geoengineering. Papers on the physics of climate engineering should be submitted to this joint session, and on ethical and governance issues related to climate engineering to the session "Ethics and governance of weather modification and geoengineering" at the 22nd Conference on Planned and Inadvertent Weather Modification. Invited keynote speaker: Simone Tilmes (NCAR). Session Chair: Alan Robock (Rutgers University)."

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