20.10.2021

# Political Papers

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University of York (2021): Geoengineering: A climate of uncertainty. Youth guide and policy brief on geoengineering

University of York (2021): Geoengineering: A climate of uncertainty. Youth guide and policy brief on geoengineering. Available online at https://www.york.ac.uk/media/educationalstudies/documents/research/uyseg/best/Geoengineering%20-%20a%20climate%20of%20uncertainty.pdf.

"The purpose of this guide is to introduce key ideas and questions about geoengineering in order to spark a conversation about intervention in the Earth's climate system in the context of the range of possible responses to the climate crisis. It has been written by young people, for young people."

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20.10.2021

# New Publications

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Stephens, Jennie C.; et al. (2021): The Dangers of Mainstreaming Solar Geoengineering: A critique of the National Academies Report

Stephens, Jennie C.; Kashwan, Prakash; McLaren, Duncan; Surprise, Kevin (2021): The Dangers of Mainstreaming Solar Geoengineering: A critique of the National Academies Report. In Environmental Politics 376 (3), pp. 1–10. DOI: 10.1080/09644016.2021.1989214.

"The U.S. National Academies of Science, Engineering and Medicine (NASEM) 2021 report on solar geoengineering research is a political intervention in global climate politics. Although the NASEM report explicitly acknowledges the risks of unilateral research without broad-based public participation and global governance, the report minimizes these concerns by recommending that the U.S. act swiftly to establish a publicly funded national research program. By providing details for how the research program should be designed, the report contradicts its own recommendations for an inclusive and international process. By mainstreaming solar geoengineering, the report risks increasing the likelihood of international conflict and unilateral deployment, and further exacerbates delays in prioritizing other climate actions. Instead of expanding research on global manipulation of the earth’s climate, the United States, like other countries around the world, should commit to multilateral, coordinated efforts to phase out fossil fuels, advance global climate action, and invest in climate justice."

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08.10.2021

# Media

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VDE-Dialog: A sun umbrella in space (German)

German newspaper article on Solar Radiation Management.

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07.10.2021

# Media

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Deccan Herald: Reducing global warming: Could reflecting sunlight back into space work?

"One of the most important geoengineering options is Solar Radiation Management (SRM). SRM aims at reflecting inbound sunlight back into space, reducing the amount of heat absorbed by the earth and lowering global temperatures."

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04.10.2021

# New Publications

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Wood, Robert (2021): Assessing the potential efficacy of marine cloud brightening for cooling Earth using a simple heuristic model

Wood, Robert (2021): Assessing the potential efficacy of marine cloud brightening for cooling Earth using a simple heuristic model. In Atmos. Chem. Phys 21 (19), pp. 14507–14533. DOI: 10.5194/acp-21-14507-2021.

"A simple heuristic model is described to assess the potential for increasing solar reflection by augmenting the aerosol population below marine low clouds, which nominally leads to increased cloud droplet concentration and albedo. The model estimates the collective impact of many point source particle sprayers, each of which generates a plume of injected particles that affects clouds over a limited area."

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01.10.2021

# Media

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The New York Times: What’s the Least Bad Way to Cool the Planet?

"How to cool the planet? The energy infrastructure that powers our civilization must be rebuilt, replacing fossil fuels with carbon-free sources such as solar or nuclear. But even then, zeroing out emissions will not cool the planet. This is a direct consequence of the single most important fact about climate change: Warming is proportional to the cumulative emissions over the industrial era. [...] To cool the planet in this century, humans must either remove carbon from the air or use solar geoengineering, a temporary measure that may reduce peak temperatures, extreme storms and other climatic changes. Humans might make the planet Earth more reflective by adding tiny sulfuric acid droplets to the stratosphere from aircraft, whitening low-level clouds over the ocean by spraying sea salt into the air or by other interventions."

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29.09.2021

# Media

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Spiegel: How cloud makers are trying to save corals (German)

German newpaper article on cloud seeding above the Great Barrier Reef.

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28.09.2021

# New Publications

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Kuswanto, Heri; et al. (2021): Impact of Solar Geoengineering on Temperatures over the Indonesian Maritime Continent

Kuswanto, Heri; Kravitz, Ben; Miftahurrohmah, Brina; Fauzi, Fatkhurokhman; Sopahaluwaken, Ardhasena; Moore, John (2021): Impact of Solar Geoengineering on Temperatures over the Indonesian Maritime Continent. In Int J Climatol. DOI: 10.1002/joc.7391.

"Climate change has been projected to increase the intensity and magnitude of extreme temperature in Indonesia. Solar radiation management (SRM) has been proposed as a strategy to temporarily combat global warming, buying time for negative emissions. Though the global impacts of SRM have been extensively studied in recent years, regional impacts, especially in the tropics, have received much less attention. This paper investigates the potential stratospheric sulfate aerosol injection (SAI) to modify mean and extreme temperature, as well as the relative humidity and wet bulb temperature (WBT) change over Indonesian Maritime Continent (IMC) based on simulations from three different earth system models. We applied a simple downscaling method and corrected the bias of model output to reproduce historical temperatures and relative humidity over IMC. We evaluated changes in Geoengineering Model Intercomparison Project (GeoMIP) experiment G4, an SAI experiment in 5 Tg of SO2 into the equatorial lower stratosphere between 2020 and 2069, concurrent with the RCP4.5 emissions scenario."

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27.09.2021

# New Publications

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Tilmes, S.; et al. (2021): Sensitivity of total column ozone to stratospheric sulfur injection strategies

Tilmes, S.; Richter, J. H.; Kravitz, B.; MacMartin, D. G.; Glanville, A. S.; Visioni, D. et al. (2021): Sensitivity of total column ozone to stratospheric sulfur injection strategies. In Geophysical Research Letters. DOI: 10.1029/2021GL094058.

"We explore the impact of different stratospheric sulfur injection strategies to counter greenhouse gas induced warming on total column ozone (TCO), including high and low altitude injections at four latitudes, equatorial injections, and using a configuration with higher vertical resolution, based on a state-of-the-art Earth system model. The experiments maintain global surface temperatures at 2020 conditions, while following the unmitigated future scenario. Within the first ten years of the injection, we find an abrupt deepening of the Antarctic ozone hole by 8–20% and changes up to urn:x-wiley:00948276:media:grl63028:grl63028-math-00015% for other regions and seasons. The ozone hole recovery is delayed by urn:x-wiley:00948276:media:grl63028:grl63028-math-000225 to over 55 years, with the fastest recovery for low-altitude injections and slowest for equatorial injections. Mid to high-latitude TCO increases by urn:x-wiley:00948276:media:grl63028:grl63028-math-000315% in Northern Hemisphere winter and spring between 2010–2019 and 2080–2089 due to both increasing greenhouse gases and increasing sulfur injections. Implications for ecosystems need to be investigated."

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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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