July 2016

18.07.2016

# Media

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Climate Central: Negative Emissions Key to Meeting 2°C Threshold

Response to Sanderson, Benjamin M.; et al. (2016). "Humans will have to not only stop emitting greenhouse gases by 2085, but also develop technology that will result in negative emissions — the removal of 15 billion tons of carbon dioxide from the atmosphere each year by the end of the century —  in order to prevent global warming from exceeding 2°C (3.6°F), according to a new study."

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18.07.2016

# New Publications

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Dykema, J. A.; et al. (2016): Assessing risks of solar geoengineering starts with accurate aerosol radiative properties

Dykema, J. A.; Keith, D. W.; Keutsch, F. N. (2016): Assessing risks of solar geoengineering starts with accurate aerosol radiative properties. In Geophys. Res. Lett. DOI 10.1002/2016GL069258.

""We utilize a comprehensive radiative transfer model driven by updated, physically consistent estimates of optical properties. We compute the potential increase in stratospheric water vapor and associated longwave radiative forcing. We find that the stratospheric heating calculated in this analysis indicates some materials to be substantially riskier than previous work. We also find there are Earth-abundant materials that may reduce some principal known risks relative to sulfate aerosols.

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17.07.2016

# Media

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Geoengineering Monitor: Miserable failure at Kemper “clean coal” plant indicates future failure of “clean bioenergy” climate solution

"Since then growing attention has been given to this technofix as the main approach to removing CO2 from the overloaded atmosphere. This is in spite of the fact that there are currently no operating commercial-scale BECCS projects*, and there is ongoing serious debate over the climate and other impacts of all large scale bioenergy. There are also serious concerns about costs, feasibility and safety of underground storage."

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12.07.2016

# Media

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Geographical: Unnatural Climates

"Once we manage our climate to keep it as ‘natural’ as possible, however defined, then why should we not use such interventions to make life easier for those suffering from climate disasters? ‘Natural’ climate comes with many risks for humans, it is not a perfect world."

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12.07.2016

# Media

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Bloomberg: Blocking the Sun to Curb Global Warming?

"What about all the CO2 already in the air? Suck it out. And if that doesn’t work? A risky emergency fix based on reflective particles."

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11.07.2016

# Calls & events

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News Review of Week 29 of 2016

The news review of calendar week 29 in 2016 is now available here.


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11.07.2016

# Projects

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Project: Carnegie Climate Geoengineering Governance Project

"The Project will build on the best available assessments of the science (physical, economic, and social) as well as of the policy options available for potential governance framework (such as those being considered by the Academic Working Group on International Governance of Solar Climate Engineering, aka AWG). [...] The preparatory phase of the Project is under way. The full-scale project will, however, be only announced toward the end of 2016. The Project is expected to last into the next decade."

Link, see also link


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11.07.2016

# Media

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CSCS: Can cirrus cloud seeding help to “save” the climate? (press release)

Press release on Gasparini, Blaž; Lohmann, Ulrike (2016). "The interaction of cirrus clouds with radiation is a complex one, which depends on the concentration of ice crystals, their size, as well as on properties such as the temperature of the cloud and the underlying surface, and solar insolation.  Model calculations indicate their radiative effect accounts for about 5 Watts per square meter in global average. “Were one to eliminate all cirrus clouds, that would immediately counteract a CO2 doubling which adds a ‘warming’ impact of 3.7 Watts per square meter”, says atmospheric physicist Ulrike Lohmann of ETH Zurich. This is what makes cirrus clouds a potential target for geoengineering methods."

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11.07.2016

# New Publications

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Gasparini, Blaž; Lohmann, Ulrike (2016): Why cirrus cloud seeding cannot substantially cool the planet

Gasparini, Blaž; Lohmann, Ulrike (2016): Why cirrus cloud seeding cannot substantially cool the planet. In J. Geophys. Res. Atmos. 121 (9), pp. 4877–4893. DOI 10.1002/2015JD024666.

"The net warming effect of cirrus clouds has driven part of the geoengineering research toward the idea of decreasing their occurrence frequency by seeding them with efficient ice nucleating particles. We study responses of cirrus clouds to simplified global seeding strategies in terms of their radiative fluxes with the help of the ECHAM-HAM general circulation model. Our cirrus scheme takes into account the competition between homogeneous and heterogeneous freezing, preexisting ice crystals, and the full spectrum of updraft velocities."

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11.07.2016

# New Publications

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Boucher, Olivier; et al. (2016): Opinion: In the wake of Paris Agreement, scientists must embrace new directions for climate change research

Boucher, Olivier; Bellassen, Valentin; Benveniste, Helene; Ciais, Philippe; Criqui, Patrick; Guivarch, Celine et al. (2016): Opinion: In the wake of Paris Agreement, scientists must embrace new directions for climate change research. In Proceedings of the National Academy of Sciences of the United States of America 113 (27), pp. 7287–7290. DOI 10.1073/pnas.1607739113.

"We, as an interdisciplinary group of academic experts who have been providing independent insights to the COP21 French presidency and negotiation team (1), have seen not only the importance of science in policymaking but also its limitations and sometimes its lack of alignment with the complex environmental and societal issues addressed in the negotiations. Here we analyze research gaps and identify new directions of research in relation to a number of facets of the Paris Agreement, including the new 1.5 °C objective, the articulation between near-term and long-term mitigation pathways, negative emissions, verification, climate finance, non-Parties stakeholders, and adaptation."

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