23.03.2021

# New Publications

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McLaren, Duncan; Corry, Olaf (2021): The politics and governance of research into solar geoengineering

McLaren, Duncan; Corry, Olaf (2021): The politics and governance of research into solar geoengineering. In Wiley Interdisciplinary Reviews: Climate Change. DOI: 10.1002/wcc.707.

"This review outlines ways in which research conditions or constructs solar geoengineering in diverse ways, including the forms of possible material technologies of solar geoengineering; the criteria and targets for their assessment; the scenarios in which they might be deployed; the publics which may support or oppose them; their political implications for other climate responses, and the international relationsgovernance mechanisms, and configurations of power that are presumed in order to regulate them."

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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

# New Publications

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Kravitz, Ben; et al. (2021): Comparing different generations of idealized solar geoengineering simulations in the Geoengineering Model Intercomparison Project (GeoMIP)

Kravitz, Ben; MacMartin, Douglas G.; Visioni, Daniele; Boucher, Olivier; Cole, Jason N. S.; Haywood, Jim et al. (2021): Comparing different generations of idealized solar geoengineering simulations in the Geoengineering Model Intercomparison Project (GeoMIP). In Atmos. Chem. Phys 21 (6), pp. 4231–4247. DOI: 10.5194/acp-21-4231-2021.

"Two generations of models in the Geoengineering Model Intercomparison Project (GeoMIP) have now simulated offsetting a quadrupling of the CO2 concentration with solar reduction. This simulation is idealized and designed to elicit large responses in the models. Here, we show that energetics, temperature, and hydrological cycle changes in this experiment are statistically indistinguishable between the two ensembles."

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22.03.2021

# Media

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Eos: Improving Models for Solar Climate Intervention Research

"Modern climate models were designed to simulate natural systems and changes mainly due to atmospheric carbon dioxide, rather than to predict effects of deliberate climate interventions."

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22.03.2021

# Media

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C2G: Refocusing C2G on catalysing the governance of Solar Radiation Modification

"In late February, UN Climate Change (UNFCCC) revealed that 75 Parties which had submitted new or updated commitments under the Paris Agreement – representing 30% of global greenhouse gas emissions – fell far short of the 45% cut needed to limit global warming to 1.5°C."

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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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18.03.2021

# New Publications

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Clarke, Leonardo A.; et al. (2021): The Caribbean and 1.5 °C: Is SRM an Option?

Clarke, Leonardo A.; Taylor, Michael A.; Centella-Artola, Abel; St. Williams, Matthew M.; Campbell, Jayaka D.; Bezanilla-Morlot, Arnoldo; Stephenson, Tannecia S. (2021): The Caribbean and 1.5 °C: Is SRM an Option? In Atmosphere 12 (3), p. 367. DOI: 10.3390/atmos12030367.

"This paper examines the mean Caribbean climate under various scenarios of an SRM-altered versus an SRM-unaltered world for three global warming targets, namely, 1.5, 2.0 and 2.5 °C above pre-industrial levels."

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17.03.2021

# Media

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Arctic Today: Sámi join call to cancel a geoengineering technology test in northern Sweden

"A range in Arctic Sweden would be used to test technology related to potential future geoengineering efforts."

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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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