26.05.2017

# New Publications

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Ying, Chen; Yuan, Xin (2017): Implications of geoengineering under the 1.5 °c target. Analysis and policy suggestions

Ying, Chen; Yuan, Xin (2017): Implications of geoengineering under the 1.5 °c target. Analysis and policy suggestions. In: Advances in Climate Change Research. DOI: 10.1016/j.accre.2017.05.003

"In this context, geoengineering is gaining interest in the international arena. The Paris Agreement includes afforestation, carbon capture, utilization and storage, and negative emission technologies such as bio-energy with carbon capture and store. All of these techniques are CO2 removal technologies that belong to geoengineering. Solar radiation management, which is highly controversial, has also attracted increased attention in recent years."

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20.05.2017

# New Publications

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Xia, Lili; et al. (2017): Impacts of Stratospheric Sulfate Geoengineering on Tropospheric Ozone

Xia, Lili; Nowack, Peer J.; Tilmes, Simone; Robock, Alan (2017): Impacts of Stratospheric Sulfate Geoengineering on Tropospheric Ozone. In: Atmos. Chem. Phys. Discuss., S. 1–38. DOI: 10.5194/acp-2017-434

"Using a version of the Community Earth System Model from the National Center for Atmospheric Research that includes comprehensive tropospheric and stratospheric chemistry, we model both stratospheric sulfur injection and solar irradiance reduction schemes, with the aim of achieving equal levels of surface cooling relative to the Representative Concentration Pathway 6.0 scenario. This allows us to compare the impacts of sulfate aerosol and solar dimming on atmospheric ozone concentrations."

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19.05.2017

# New Publications

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Field, Christopher B.; Mach, Katharine J. (2017): Rightsizing carbon dioxide removal

Field, Christopher B.; Mach, Katharine J. (2017): Rightsizing carbon dioxide removal. In: Science 356 (6339), S. 706–707. DOI: 10.1126/science.aam9726

"Betting the future on planetary-scale carbon dioxide removal from the atmosphere is risky."

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19.05.2017

# New Publications

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Boysen, Lena R.; et al. (2017): The limits to global-warming mitigation by terrestrial carbon removal

Boysen, Lena R.; Lucht, Wolfgang; Gerten, Dieter; Heck, Vera; Lenton, Timothy M.; Schellnhuber, Hans Joachim (2017): The limits to global-warming mitigation by terrestrial carbon removal. In: Earth's Future 4, S. 514. DOI: 10.1002/2016EF000469 

"Massive near-term greenhouse gas emissions reduction is a precondition for staying “well below 2°C” global warming as envisaged by the Paris Agreement. Furthermore, extensive terrestrial carbon dioxide removal (tCDR) through managed biomass growth and subsequent carbon capture and storage is required to avoid temperature “overshoot” in most pertinent scenarios."

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17.05.2017

# New Publications

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Sandler, Todd (2017): Collective action and geoengineering

Sandler, Todd (2017): Collective action and geoengineering. In: Rev Int Organ 39 (1), S. 45. DOI: 10.1007/s11558-017-9282-3

"This paper investigates some of the myriad collective action implications of geoengineering. Its two major components – carbon dioxide reduction and albedo modification – present diverse collective action and strategic aspects. Carbon dioxide reduction may be characterized by Prisoners’ Dilemma, threshold, or harmony games, depending on capture and sequestration procedures. In contrast, albedo modification may abide by chicken, coordination, or threshold games."

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15.05.2017

# New Publications

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Gaidos, Eric (2017): Transit Detection of a "Starshade" at the Inner Lagrange Point of an Exoplanet

Gaidos, Eric (2017): Transit Detection of a "Starshade" at the Inner Lagrange Point of an Exoplanet. (in press). In: Earth and Planetary Astrophysics.

"Reflectors or scatterers placed near Earth's inner Lagrange point (L1) have been proposed as a 'geo-engineering" solution to anthropogenic climate change and an advanced version of this could modulate incident irradiation over many Gyr or "rescue" a planet from the interior of the habitable zone. The distance of the starshade from the planet that minimizes its mass is 1.6 times the Earth-L1 distance. Such a starshade would have to be similar in size to the planet and the mutual occultations during planetary transits could produce a characteristic maximum at mid-transit in the light-curve."

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11.05.2017

# New Publications

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Muraca, Barbara; Neuber, Frederike (2017): Viable and convivial technologies. Considerations on Climate Engineering from a degrowth perspective

Muraca, Barbara; Neuber, Frederike (2017): Viable and convivial technologies. Considerations on Climate Engineering from a degrowth perspective. In: Journal of Cleaner Production. DOI: 10.1016/j.jclepro.2017.04.159

"This paper articulates a critical analysis of Climate Engineering technologies from a point of view situated within the degrowth discourse. In the first part two approaches discussed within the degrowth debate are presented: the concept of viability based on a biophysical perspective and the concept of conviviality based on a socio-cultural approach. In a second step formalized arguments from the point of view of applied ethics are articulated and applied to three Climate Engineering Technologies: Sulfate Aerosol Injection, Bio-energy with Carbon Capture and Storage, and Afforestation. In a third step, an extended version of the trade-off argument about mitigation versus Climate Engineering solution is discussed from a degrowth perspective: accordingly, within the current dominant growth paradigm, climate engineering technologies might lead to reduced mitigation efforts."

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11.05.2017

# New Publications

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Hong, Yu; et al. (2017): Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation

Hong, Yu; Moore, John C.; Jevrejeva, Svetlana; Ji, Duoying; Phipps, Steven J.; Lenton, Andrew et al. (2017): Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation. In: Environ. Res. Lett. 12 (3). DOI: 10.1088/1748-9326/aa5fb8

"We analyze the multi-earth system model responses of ocean temperatures and the Atlantic Meridional Overturning Circulation (AMOC) under an idealized solar radiation management scenario (G1) from the Geoengineering Model Intercomparison Project. All models simulate warming of the northern North Atlantic relative to no geoengineering, despite geoengineering substantially offsetting the increases in mean global ocean temperatures. Increases in the temperature of the North Atlantic Ocean at the surface (~0.25 K) and at a depth of 500 m (~0.10 K) are mainly due to a 10 Wm−2 reduction of total heat flux from ocean to atmosphere."

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11.05.2017

# New Publications

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Braun, Carola; et al. (2017): Public perception of climate engineering and carbon capture and storage in Germany. Survey evidence

Braun, Carola; Merk, Christine; Pönitzsch, Gert; Rehdanz, Katrin; Schmidt, Ulrich (2017): Public perception of climate engineering and carbon capture and storage in Germany. Survey evidence. In: Climate Policy 5 (1), S. 1–14. DOI: 10.1080/14693062.2017.1304888

"Climate engineering (CE) and carbon capture and storage are controversial options for addressing climate change. This study compares public perception in Germany of three specific measures: solar radiation management (SRM) via stratospheric sulphate injection, large-scale afforestation, and carbon capture and storage sub-seabed (CCS-S). In a survey experiment we find that afforestation is most readily accepted as a measure for addressing climate change, followed by CCS-S and lastly SRM, which is widely rejected."

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09.05.2017

# New Publications

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Chabbi, A.; et al. (2017): Aligning agriculture and climate policy

Chabbi, A.; Lehmann, J.; Ciais, P.; Loescher, H. W.; Cotrufo, M. F.; Don, A. et al. (2017): Aligning agriculture and climate policy. In: Nature Climate change 7 (5), S. 307–309. DOI: 10.1038/nclimate3286.

"The 4‰ initiative to sequester carbon in soils has the potential to connect sustainable development goals, enhance food security and mitigate climate change by utilizing waste organic residues."

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