July 2018

16.07.2018

# Media

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Nature Energy: NET gains

"Negative emissions technologies face numerous challenges, from techno-economic hurdles to public acceptance concerns, but progress in research, collaboration and regulation provide indications that they may yet form part of future energy systems."

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16.07.2018

# Calls & events

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Call for Abstracts: Carbon: Challenges and Opportunities for the 21st Century (AGU 2018)

Deadline: 01. August 2018

"Carbon is an integral building block of life on Earth and has fueled unprecedented economic and societal progress. But with progress has come significant increases in atmospheric carbon dioxide and methane, causing warming and other health and environmental impacts. While efforts to reduce reliance on carbon-based fuels proceed, there is also growing attention to ways to remove carbon from the atmosphere, reliably sequester it, and develop commercial uses for it. Recent National Academies’ reports address scientific and technical issues related to methane emissions monitoring, measurement, and verification; a range of carbon dioxide removal and storage approaches; and utilization of carbon waste streams. This session will expand on these topics, inviting presentations that discuss the challenges and opportunities associated with evolving approaches to manage carbon."

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16.07.2018

# New Publications

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Zhu, Kai; et al. (2018): Limits to growth of forest biomass carbon sink under climate change

Zhu, Kai; Zhang, Jian; Niu, Shuli; Chu, Chengjin; Luo, Yiqi (2018): Limits to growth of forest biomass carbon sink under climate change. In: nature communications 9 (1), S. 2709. DOI: 10.1038/s41467-018-05132-5.

"To address both processes, we compiled a forest inventory dataset from North America to quantify aboveground biomass growth with stand age across forest types and climate gradients. Here we show, the biomass grows from 90 Mg ha–1 (2000–2016) to 105 Mg ha–1 (2020 s), 128 Mg ha–1 (2050 s), and 146 Mg ha–1 (2080 s) under climate change scenarios with no further disturbances. Climate change modifies the forest recovery trajectory tosome extent, but the overall growth is limited, showing signs of biomass saturation. Thefuture (2080s) biomass will only sequester at most 22% more carbon than the current level.Given such a strong sink has limited growth potential, our ground-based analysis suggests policy changes to sustain the carbon sink."

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16.07.2018

# New Publications

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Keller, David P.; et al. (2018): The Carbon Dioxide Removal Model Intercomparison Project (CDRMIP)

Keller, David P.; Lenton, Andrew; Scott, Vivian; Vaughan, Naomi E.; Bauer, Nico; Ji, Duoying et al. (2018): The Carbon Dioxide Removal Model Intercomparison Project (CDRMIP). Rationale and experimental protocol for CMIP6. In: Geosci. Model Dev. 11 (3), S. 1133–1160. DOI: 10.5194/gmd-11-1133-2018.

"At present, there is little consensus on the climate impacts and atmospheric CO2 reduction efficacy of the different types of proposed CDR. To address this need, the Carbon Dioxide Removal Model Intercomparison Project (or CDRMIP) was initiated. This project brings together models of the Earth system in a common framework to explore the potential, impacts, and challenges of CDR. Here, we describe the first set of CDRMIP experiments, which are formally part of the 6th Coupled Model Intercomparison Project (CMIP6). These experiments are designed to address questions concerning CDR-induced climate reversibility, the response of the Earth system to direct atmospheric CO2 removal (direct air capture and storage), and the CDR potential and impacts of afforestation and reforestation, as well as ocean alkalinization."

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16.07.2018

# New Publications

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Dékány, Anett (2018): Climate Justice and Geoengineering

Dékány, Anett (2018): Preston, C.J. (ed.). Climate Justice and Geoengineering: Ethics and Policy in the Atmospheric Anthropocene. In: HunGeoBull 67 (2), S. 191–193. DOI: 10.15201/hungeobull.67.2.7.

"The current edited volume is a remarkable initiative to provide a comprehensive and comparative overview of climatic technologies and ethical issues in their interrelations. It gives us the opportunity to evaluate technologies while taking into consideration key ethical challenges, and to gain a better understanding of alternative climate policies. Thanks to the fairness approach the list of contributors includes both advocates of climate intervention research and its sceptics."

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15.07.2018

# New Publications

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Hemes, Kyle S.; et al. (2018): A Biogeochemical Compromise. The High Methane Cost of Sequestering Carbon in Restored Wetlands

Hemes, Kyle S.; Chamberlain, Samuel D.; Eichelmann, Elke; Knox, Sara H.; Baldocchi, Dennis D. (2018): A Biogeochemical Compromise. The High Methane Cost of Sequestering Carbon in Restored Wetlands. In: Geophys. Res. Lett. 121 (8), S. 777. DOI: 10.1029/2018GL077747.

"Here we present 14 site years of continuous CH4 and CO2 ecosystem‐scale gas exchange over a network of restored freshwater wetlands in California, where long growing seasons, warm weather, and managed water tables result in some of the largest wetland ecosystem CH4 emissions recorded. These large CH4 emissions cause the wetlands to be strong greenhouse gas sources while sequestering carbon and building peat soil. The terms of this biogeochemical compromise, dictated by the ratio between carbon sequestration and CH4 emission, vary considerably across small spatial scales, despite nearly identical wetland climate, hydrology, and plant community compositions."

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14.07.2018

# Political Papers

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German Bundestag (2018): Risk Assessment of Climate Engineering

Committee on Education, Research and Technology Assessment/Answer - 12. July 2018 (hib 515/2018)

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11.07.2018

# Calls & events

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Job at Carnegie Climate Geoengineering Governance Initiative

Deadline: 31. July 2018

"C2G2 is seeking to hire an Outreach Officer to support C2G2 staff’s engagement with and outreach to representatives of governments and intergovernmental organisations. The position can be located anywhere in the world. The position starts as soon as possible."

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09.07.2018

# Calls & events

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Newsletter of Week 28 of 2018

The newsletter of calendar week 28 in 2018 is now available here.


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09.07.2018

# New Publications

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Horton, Joshua B.; et al. (2018): Solar Geoengineering and Democracy

Horton, Joshua B.; Reynolds, Jesse L.; Buck, Holly Jean; Callies, Daniel; Schäfer, Stefan; Keith, David W.; Rayner, Steve (2018): Solar Geoengineering and Democracy. In: Global Environmental Politics 46 (2), S. 5–24. DOI: 10.1162/glep_a_00466.

"Some scientists suggest that it might be possible to reflect a portion of incoming sunlight back into space to reduce climate change and its impacts. Others argue that such solar radiation management (SRM) geoengineering is inherently incompatible with democracy. In this article, we reject this incompatibility argument. "

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