22.06.2018

# Media

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Carbon Brief: Guest post: Seven key things to know about ‘negative emissions’

"Despite the ambitious long-term climate goals of the Paris Agreement, there remains a distinct lack of success at ushering in immediate and sustained reductions in global CO2 emissions. This cognitive dissonance has seen the topic of “negative emissions” – also known as “carbon dioxide removal” (CDR) – move into the limelight in climate science and policy discussions."

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08.06.2018

# New Publications

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Roshan, Elnaz; et al. (2018): Cost-Risk Trade-Off of Mitigation and Solar Geoengineering. Considering Regional Disparities Under Probabilistic Climate Sensitivity

Roshan, Elnaz; M. Khabbazan, Mohammad; Held, Hermann (2018): Cost-Risk Trade-Off of Mitigation and Solar Geoengineering. Considering Regional Disparities Under Probabilistic Climate Sensitivity. In Environ Resource Econ 113 (9), p. 5886. DOI: 10.1007/s10640-018-0261-9.

"Here, we investigate to what extent a proponent of the 2 °C-temperature target would apply SGE in conjunction with mitigation in view of regional disparities in temperature and precipitation. We apply cost-risk analysis (CRA), which is a decision analytic framework that trades-off expected welfare-loss from climate policy costs and climate risks from transgressing a climate target. Here, in ‘Giorgi’-regional-scale analyses, we evaluate the optimal mix of SGE and mitigation under probabilistic information about climate sensitivity and generalize CRA in order to include regional temperature and precipitation risks."

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29.05.2018

# New Publications

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Seitz, Russell (2018): Engineer solar solutions locally to save water

Seitz, Russell (2018): Engineer solar solutions locally to save water. In Nature 557 (7705), p. 309. DOI: 10.1038/d41586-018-05151-8.

"I suggest that some of the money spent on arguing about global governance of geoengineering could be better used to develop local water-conservation technologies."

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27.05.2018

# Media

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Forbes: Ask Ethan: Can We Build A Sun Screen To Combat Global Climate Change?

"Global climate change is one of the most pressing long-term issues facing humanity today. The science is abundantly clear on what's happening and why: the Earth is getting warmer, human-caused emission of heat-trapping greenhouse gases is the reason, and the concentration of these gases only continues to rise, unabated, over time. While there are a great many calls to reduce emissions, capture carbon, and move away from fossil fuels, there's little that's effectively been done."

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26.05.2018

# New Publications

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Tilmes, Simone; et al. (2018): CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble (GLENS) Project

Tilmes, Simone; Richter, Jadwiga H.; Kravitz, Ben; MacMartin, Douglas G.; Mills, Michael J.; Simpson, Isla R. et al. (2018): CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble (GLENS) Project. In Bulletin of the American Meteorological Society. DOI: 10.1175/BAMS-D-17-0267.1.

"This paper describes the stratospheric aerosol geoengineering large ensemble (GLENS) project, which promotes the use of a unique model dataset, performed with the Community Earth System Model, with the Whole Atmosphere Community Climate Model as its atmospheric component (CESM1(WACCM)), to investigate global and regional impacts of geoengineering. The performed simulations were designed to achieve multiple simultaneous climate goals, by strategically placing sulfur injections at four different locations in the stratosphere, unlike many earlier studies that targeted globally averaged surface temperature by placing injections in regions at or around the equator."

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26.05.2018

# New Publications

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Eastham, Sebastian D.; et al. (2018): Quantifying the impact of sulfate geoengineering on mortality from air quality and UV-B exposure

Eastham, Sebastian D.; Weisenstein, Debra K.; Keith, David W.; Barrett, Steven R.H. (2018): Quantifying the impact of sulfate geoengineering on mortality from air quality and UV-B exposure. In Atmospheric Environment. DOI: 10.1016/j.atmosenv.2018.05.047.

"Using a chemistry-transport model, we quantify the steady-state response of three public health risks to 1 °C global mean surface cooling. We separate impacts into those which are “radiative forcing-driven”, associated with climate change “reversal” through modification of global radiative forcing, and those “direct impacts” associated uniquely with using sulfate geoengineering to achieve this. We find that the direct (non-radiative forcing driven) impact is a decrease in global mortality of ∼13,000 annually."

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26.05.2018

# New Publications

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Sugiyama, Masahiro; et al. (2017): Next steps in geoengineering scenario research. Limited deployment scenarios and beyond

Sugiyama, Masahiro; Arino, Yosuke; Kosugi, Takanobu; Kurosawa, Atsushi; Watanabe, Shingo (2017): Next steps in geoengineering scenario research. Limited deployment scenarios and beyond. In Climate Policy 18 (6), pp. 681–689. DOI: 10.1080/14693062.2017.1323721.

" In light of concerns over risks, a newer set of scenarios is desirable, which represents both uncertainties and social choices more fully. Borrowing and extending lessons from recent literature on the new community climate scenario process, we envision a possible scenario-building process that combines interdisciplinary scholarship with the involvement of stakeholders and citizens. The resultant scenarios would better characterize uncertainties of, and policy choices for, solar geoengineering, and foster critical appraisal of its risks and benefits."

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22.05.2018

# New Publications

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Field, L.; et al. (2018): Increasing Arctic Sea Ice Albedo Using Localized Reversible Geoengineering

Field, L.; Ivanova, D.; Bhattacharyya, S.; Mlaker, V.; Sholtz, A.; Decca, R. et al. (2018): Increasing Arctic Sea Ice Albedo Using Localized Reversible Geoengineering. In Earth's Future. DOI: 10.1029/2018EF000820.

"In this paper, a novel localized surface albedo modification technique is presented that shows promise as a method to increase multi‐year ice using reflective floating materials, chosen so as to have low subsidiary environmental impact. Detailed climate modeling studying the climate impact of such a method reveals more than 1.5 °C cooler temperatures over a large part of the Arctic when simulating global sea ice albedo modification. In a region north of Barents and Kara Seas temperatures have been reduced by 3 °C and in North Canada by almost 1 °C. Additionally, there are notable increases in sea ice thickness (20‐50 cm Arctic wide) and ice concentration (>15‐20% across large parts of central Arctic). These results suggest that the geoengineering technology proposed in this study may be a viable instrument for restoring Arctic ice. "

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14.05.2018

# New Publications

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Plazzotta, Maxime; et al. (2018): Land surface cooling induced by sulfate geoengineering constrained by major volcanic eruptions

Plazzotta, Maxime; Séférian, Roland; Douville, Hervé; Kravitz, Ben; Tjiputra, Jerry (2018): Land surface cooling induced by sulfate geoengineering constrained by major volcanic eruptions. In Geophys. Res. Lett. DOI: 10.1029/2018GL077583.

"Solar radiation management by stratospheric aerosol injection (SRM‐SAI) has been proposed as a possible method to counteract anthropogenic global warming, with climate models suggesting it could reduce substantially global temperature and associated impacts. Its effectiveness as simulated by Earth system models (ESMs) exhibits however large uncertainties, implying high risks for natural and human ecosystems. Here we identify an emergent relationship linking the long‐term global land surface cooling due to SRM‐SAI and the short‐term cooling following the 20th century major volcanic eruptions across an ESMs ensemble."

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11.05.2018

# New Publications

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Richter, Jadwiga H.; et al. (2018): Stratospheric response in the first geoengineering simulation meeting multiple surface climate objectives

Richter, Jadwiga H.; Tilmes, Simone; Glanville, Anne A.; Kravitz, Ben; MacMartin, Douglas G.; Mills, Michael J. et al. (2018): Stratospheric response in the first geoengineering simulation meeting multiple surface climate objectives. In J. Geophys. Res. Atmos. DOI: 10.1029/2018JD028285.

"We describe here changes in stratospheric dynamics and chemistry in a first century‐long sulfate aerosol geoengineering simulation in which the mean surface temperature and the inter‐hemispheric and equator‐to‐pole surface temperature gradients were kept near their 2020 levels despite the RCP8.5 emission scenario. Simulations were carried out with the Community Earth System Model, version 1 with the Whole Atmosphere Community Climate Model as its atmospheric component (CESM1 (WACCM)) coupled to a feedback algorithm controlling the magnitude of sulfur dioxide (SO2) injections at four injection latitudes."

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