06.04.2021

# New Publications

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Zarnetske, Phoebe L.; et al. (2021): Potential ecological impacts of climate intervention by reflecting sunlight to cool Earth

Zarnetske, Phoebe L.; Gurevitch, Jessica; Franklin, Janet; Groffman, Peter M.; Harrison, Cheryl S.; Hellmann, Jessica J. et al. (2021): Potential ecological impacts of climate intervention by reflecting sunlight to cool Earth. In PNAS 118 (15), e1921854118. DOI: 10.1073/pnas.1921854118.

"We focus here on stratospheric aerosol intervention (SAI), a well-studied and relatively feasible SRM scheme that is likely to have a large impact on Earth’s surface temperature. We outline current gaps in knowledge about both helpful and harmful predicted effects of SAI on ecological systems."

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23.03.2021

# Media

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C2G Guest Post: Stratospheric aerosol injection could be a painkiller, but not a cure – and more research is needed

"It has to be clear that at best SAI would be a complement to emission reductions, which have to be the absolute priority, and probably carbon dioxide removal. SAI could reduce climate change impacts, but it would not contribute to the ‘solution’."

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23.03.2021

# New Publications

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Proctor, Jonathan (2021): Atmospheric opacity has a nonlinear effect on global crop yields

Proctor, Jonathan (2021): Atmospheric opacity has a nonlinear effect on global crop yields. In Nat Food 2 (3), pp. 166–173. DOI: 10.1038/s43016-021-00240-w.

"By leveraging year-to-year variation in growing-season cloud optical thickness, I provide nonlinear empirical estimates of how increased atmospheric opacity alters sunlight across the Earth’s surface and how this affects maize and soy yields in the United States, Europe, Brazil and China."

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23.03.2021

# Media

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The Times: Bill Gates backs bid to cool Earth with chalk dust

"A large balloon will be released in Sweden this summer near the Arctic town of Kiruna. As it climbs to an altitude of 12 miles it will cross a historic threshold: the first serious attempt to explore whether global warming could be kept in check by dimming the sun."

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22.03.2021

# Political Papers

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C2G Policy Brief (2021): Climate-Altering Approaches and the Arctic

C2G Policy Brief (2021): Climate-Altering Approaches  and the Arctic. 17th March 2021 - 2nd Edition.

"The Arctic plays a key role in the global climate system. Current commitments made under the 2015 Paris Agreement on climate change are insufficient to keep global warming to ‘well below’ 2°C, and according to the Intergovernmental Panel on Climate Change (IPCC), much greater ambition is necessary."

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15.03.2021

# New Publications

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Corbett, Charles R. (2021): “Extraordinary” and “Highly Controversial”: Federal Research of Solar Geoengineering Under NEPA

Corbett, Charles R. (2021): “Extraordinary” and “Highly Controversial”: Federal Research of Solar Geoengineering Under NEPA. In Nw. U. L. Rev. Online 115 (240). Available online at https://scholarlycommons.law.northwestern.edu/cgi/viewcontent.cgi?article=1307&context=nulr_online&fbclid=IwAR0kQGReczRbpsuRrn1WgZnh5QI2QwEsULw5irDYt1fBz-cCKoN6vtMY-as.

"Congress recently instructed the National Oceanic and Atmospheric Administration (NOAA) to investigate stratospheric aerosols, materials that could be injected in the atmosphere as a means of solar climate intervention. This action has been widely interpreted as the first-ever federal research project into solar geoengineering—proposals to slightly “dim the sun” to limit the harms of climate change. This Essay argues that NOAA should use its discretion to conduct a programmatic environmental assessment under the National Environmental Policy Act (NEPA) as an initial step in governing this research program."

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12.03.2021

# New Publications

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Lee, Hanna; et al. (2021): The response of terrestrial ecosystem carbon cycling under different aerosol-based radiation management geoengineering

Lee, Hanna; Muri, Helene; Ekici, Altug; Tjiputra, Jerry; Schwinger, Jörg (2021): The response of terrestrial ecosystem carbon cycling under different aerosol-based radiation management geoengineering. In Earth Syst. Dynam. 12 (1), pp. 313–326. DOI: 10.5194/esd-12-313-2021.

"Here we assess the changes in ecosystem carbon exchange and storage among different terrestrial biomes under three aerosol-based radiation management methods with the baseline of RCP8.5 using an Earth system model (NorESM1-ME)."

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10.03.2021

# New Publications

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Adeniyi, Mojisola O.; Bassey, Blessing E. I. (2021): Precipitation and temperature response to sea salt injection into low marine clouds over West Africa

Adeniyi, Mojisola O.; Bassey, Blessing E. I. (2021): Precipitation and temperature response to sea salt injection into low marine clouds over West Africa. In SN Applied Sciences 3 (3), pp. 1–14. DOI: 10.1007/s42452-021-04388-9.

"Sea salt injection into the tropical marine clouds is evaluated for its potentials to reduce the negative impact of the prevailing global warming over West Africa."

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01.03.2021

# Media

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The Economist: Dusting the upper atmosphere could help counter climate change

"An experiment to test the idea could soon start in Sweden."

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19.02.2021

# New Publications

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Robrecht, Sabine; et al. (2021): Potential of future stratospheric ozone loss in the midlatitudes under global warming and sulfate geoengineering

Robrecht, Sabine; Vogel, Bärbel; Tilmes, Simone; Müller, Rolf (2021): Potential of future stratospheric ozone loss in the midlatitudes under global warming and sulfate geoengineering. In Atmospheric Chemistry and Physics 21 (4), pp. 2427–2455. DOI: 10.5194/acp-21-2427-2021.

"Therefore, the results of the Geoengineering Large Ensemble Simulations (GLENS) for the lowermost-stratospheric mixing layer between tropospheric and stratospheric air are considered together with 10-day box-model simulations performed with the Chemical Lagrangian Model of the Stratosphere (CLaMS). In GLENS two future scenarios are simulated: the RCP8.5 global warming scenario and a geoengineering scenario, where sulfur is additionally injected into the stratosphere to keep the global mean surface temperature from changing."

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