20.09.2021

# Media

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The Times: Geoengineering by Gernot Wagner review — a new, quick way to avert a climate catastrophe?

"Solar geoengineering sounds like the dreams of a Bond villain, but this fast and cheap solution to global warming is a real option."

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17.09.2021

# New Publications

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Austin, Maura M.K.; Converse, Benjamin A. (2021): In search of weakened resolve: Does climate-engineering awareness decrease individuals’ commitment to mitigation?

Austin, Maura M.K.; Converse, Benjamin A. (2021): In search of weakened resolve: Does climate-engineering awareness decrease individuals’ commitment to mitigation? In Journal of Environmental Psychology 356 (6335), p. 101690. DOI: 10.1016/j.jenvp.2021.101690.

"As climate predictions become more dire, it is increasingly clear that society cannot rely on mitigation alone. In response, climatologists and engineers have been developing climate-engineering technology to directly intervene on the climate through strategies such as solar radiation management and carbon dioxide removal. While these technologies have some encouraging features, they also involve risk on many dimensions. One behavioral risk that concerns many observers is the possibility that the prominence of climate-engineering scenarios could decrease the public's commitment to mitigation, a concern variously described as moral hazard or weakened resolve. Across 8 experiments (N = 2514) we tested whether exposure to naturalistic information about climate-engineering technology decreases individuals' commitment to mitigation efforts."

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13.09.2021

# Media

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Podcast: Research ethics in geoengineering - Jude Galbraith

"How do ethics considerations affect the choices made by researchers as they propose and optimise geoengineering models?"

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08.09.2021

# New Publications

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Tully, Colin; et al. (2021): Cirrus cloud thinning using a more physically-based ice microphysics scheme in the ECHAM-HAM GCM [preprint], in review

Tully, Colin; Neubauer, David; Omanovic, Nadja; Lohmann, Ulrike (2021): Cirrus cloud thinning using a more physically-based ice microphysics scheme in the ECHAM-HAM GCM [preprint], in review. In Atmos. Chem. Phys. Discuss. DOI: 10.5194/acp-2021-685.

"Cirrus cloud thinning (CCT) is a relatively new radiation management proposal to counteract anthropogenic climate warming by targeting Earth’s terrestrial radiation balance. The efficacy of this method was presented in several general circulation model (GCM) studies that showed widely varied radiative responses, originating in part from the differences in the representation of cirrus ice microphysics between the different GCMs. The recent implementation of a new, more physically based ice microphysics scheme (Predicted Particle Properties, P3) that abandons ice hydrometeor size class separation into the ECHAM-HAM GCM, coupled to a new approach for calculating cloud fractions that increases the relative humidity (RH) thresholds for cirrus cloud formation, motivated a reassessment of CCT efficacy."

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08.09.2021

# New Publications

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Ricke, Katharine; Moreno-Cruz, Juan (2020): Geo-Wedges: A Portfolio Approach to Geoengineering the Climate

Ricke, Katharine; Moreno-Cruz, Juan (2020): Geo-Wedges: A Portfolio Approach to Geoengineering the Climate. In : Reference Module in Earth Systems and Environmental Sciences, vol. 531: Elsevier, p. 362.

"A host of methods to combat climate change through geoengineering could be available soon. These methods can reduce the concentrations of carbon in the atmosphere, limit the amount of incoming solar radiation or perturb the Earth's radiation balance in other ways. They may be implemented to slow down the rate of temperature change and limit the impacts of climate change. Any one technology could be too risky or costly to do the job by itself, but a coordinated intervention that employs different methods with diverse attributes could achieve climate impact reduction goals while limiting risk."

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30.08.2021

# Media

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The Guardian: What if it’s too late to save our planet without geoengineering?

"Climate engineering sounds scary. But is coming whether we like it or not, this scientist says." (Interview with Holly Jean Buck)

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30.08.2021

# Media

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Nature: Can artificially altered clouds save the Great Barrier Reef?

"Australian scientists are rushing to develop new technologies — such as ways to block sunlight — to help preserve corals in the face of climate change."

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30.08.2021

# New Publications

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Zhang, Yan; et al. (2021): Data from: How large is the design space for stratospheric aerosol geoengineering?

Zhang, Yan; MacMartin, Douglas G.; Visioni, Daniele; Kravitz, Ben (2021): Data from: How large is the design space for stratospheric aerosol geoengineering?

"Data in support of research: Stratospheric aerosol injection (SAI), as a possible supplement to emission reduction, has the potential to reduce some of the risks associated with climate change. Adding aerosols to the lower stratosphere results in global cooling. However, different choices for the aerosol injection latitude(s) and season(s) have been shown to lead to significant differences in regional surface climate, introducing a design aspect to SAI. Past research has shown that there are at least three independent degrees of freedom (DOF) that can be used to simultaneously manage three different climate goals. Knowing how many more DOFs there are, and thus how many independent climate goals can be simultaneously managed, is essential to understanding fundamental limits of how well SAI might compensate for anthropogenic climate change, and evaluating any underlying trade-offs between different climate goals. Here we quantify the number of meaningfully-independent DOFs of the SAI design space."

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25.08.2021

# Media

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PhysOrg: How will the global community react if vulnerable nations pioneer solar radiation geoengineering?

"Jonathan Gilligan, associate professor of Earth and environmental sciences and civil and environmental engineering, and a group of international researchers have illustrated potential international conflicts over climate change."

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23.08.2021

# New Publications

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Marchegiani, Davide; Dommenget, Dietmar (2021): Counteracting global warming by using a locally optimized solar radiation management

Marchegiani, Davide; Dommenget, Dietmar (2021): Counteracting global warming by using a locally optimized solar radiation management. In Earth and Space Science. DOI: 10.1002/essoar.10507751.1.

"Here, using the Globally Resolved Energy Balance (GREB) model, we present experiments designed to completely offset global and regional surface temperature response due to CO2 forcing."

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