18.11.2014

# Media

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ClickGreen: Real-life tests needed to find true viability of climate engineering

"Now, a team of researchers from the Harvard School of Engineering and Applied Sciences (SEAS) has outlined how a small-scale “stratospheric perturbation experiment” could work. By proposing, in detail, a way to take the science of geoengineering to the skies, they hope to stimulate serious discussion of the practice by policymakers and scientists."

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18.11.2014

# Media

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Harvard News: Adjusting Earth’s thermostat, with caution

"Harvard scientists say aspects of solar geoengineering can—and should—be tested without need for full-scale deployment"

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18.11.2014

# Media

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International Business Times: Controversial Plans to Slow Global Warming by Manipulating Atmosphere Reconsidered by Scientists

"Scientists are revisiting controversial propositions to manipulate the atmosphere and slow down the increase in temperatures on Earth by reflecting more of the sun's energy back into space. Researchers from Harvard School of Engineering and Applied Sciences (SEAS) are proposing a stratospheric perturbation experiment using small amounts of sulphuric acid to block sunlight."

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17.11.2014

# New Publications

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Parker, Andy (2014): Governing solar geoengineering research as it leaves the laboratory

Parker, Andy (2014): Governing solar geoengineering research as it leaves the laboratory. In Philosophical Transactions of the Royal Society 372 (2031). DOI 10.1098/rsta.2014.0173.

"As a piece of pragmatic policy analysis, this paper explores the practicalities and implications of demands for ‘governance before research’. It concludes that ‘governance before research’ is a desirable goal, but that a delay in experimentation—a moratorium—would probably be an ineffective and counterproductive way to achieve it."

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17.11.2014

# New Publications

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Keith, David W.; et al. (2014): Field experiments on solar geoengineering: report of a workshop exploring a representative research portfolio

Keith, David W.; Duren, Riley; MacMartin, Douglas G. (2014): Field experiments on solar geoengineering: report of a workshop exploring a representative research portfolio. In Philosophical Transactions of the Royal Society 372 (2031). DOI 10.1098/rsta.2014.017.

"We summarize a portfolio of possible field experiments on solar radiation management (SRM) and related technologies. The portfolio is intended to support analysis of potential field research related to SRM including discussions about the overall merit and risk of such research as well as mechanisms for governing such research and assessments of observational needs."

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17.11.2014

# New Publications

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Dykema, John A.; et al. (2014): Stratospheric controlled perturbation experiment: a small-scale experiment to improve understanding of the risks of solar geoengineering

Dykema, John A.; Keith, David W.; Anderson, James G.; Weisenstein, Debra K. (2014): Stratospheric controlled perturbation experiment: a small-scale experiment to improve understanding of the risks of solar geoengineering. In Philosophical Transactions of the Royal Society 372 (2031). DOI 10.1098/rsta.2014.0059.

"This experiment—provisionally titled the stratospheric controlled perturbation experiment—is under development and will only proceed with transparent and predominantly governmental funding and independent risk assessment. We describe the scientific and technical foundation for performing, under external oversight, small-scale experiments to quantify the risks posed by SRM to activation of halogen species and subsequent erosion of stratospheric ozone."

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17.11.2014

# New Publications

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MacMartin, Douglas G.; et al. (2014): Solar geoengineering to limit the rate of temperature change

MacMartin, Douglas G.; Caldeira, Ken; Keith, David W. (2014): Solar geoengineering to limit the rate of temperature change. In Philosophical Transactions of the Royal Society 372 (2031). DOI 10.1098/rsta.2014.0134.

"Impacts of climate change, however, are related to the rate of change as well as its magnitude. We thus describe an alternative scenario in which solar geoengineering is used only to constrain the rate of change of global mean temperature; this leads to a finite deployment period for any emissions pathway that stabilizes global mean temperature."

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17.11.2014

# New Publications

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Connolly, P.; et al. (2014): Factors determining the most efficient spray distribution for marine cloud brightening

Connolly, P.; McFiggans, G. B.; Wood, R.; Tisiamis, A. (2014): Factors determining the most efficient spray distribution for marine cloud brightening. In Philosophical Transactions of the Royal Society 372 (2031). DOI 10.1098/rsta.2014.0056.

"We investigate the sensitivity of marine cloud brightening to the properties of the added salt particle distribution using a cloud parcel model, with an aim to address the question of, ‘what is the most efficient particle size distribution that will produce a desired cooling effect?’"

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17.11.2014

# New Publications

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Cooper, Garry; et al. (2014): Preliminary results for salt aerosol production intended for marine cloud brightening, using effervescent spray atomization

Cooper, Garry; Foster, Jack; Galbraith, Lee; Jain, Sudhanshu; Neukermans, Armand; Ormondo, Bob (2014): Preliminary results for salt aerosol production intended for marine cloud brightening, using effervescent spray atomization. In Philosophical Transactions of the Royal Society 372 (2031). DOI 10.1098/rsta.2014.0055.

"The large-scale production of vast numbers of suitable salt nuclei and their upward launch is one of the main technological barriers to the experimental testing of marine cloud brightening (MCB). Very promising, though not definitive, results have been obtained using an adapted version of effervescent spray atomization."

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17.11.2014

# New Publications

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Latham, John; et al. (2014): Marine cloud brightening: regional applications

Latham, John; Gadian, Alan; Fournier, Jim; Parkes, Ben; Wadhams, Peter; Chen, Jack (2014): Marine cloud brightening: regional applications. In Philosophical Transactions of the Royal Society 372 (2031). DOI 10.1098/rsta.2014.0053.

"This paper is concerned with preliminary studies of the possible beneficial application of MCB to three regional issues: (1) recovery of polar ice loss, (2) weakening of developing hurricanes and (3) elimination or reduction of coral bleaching. The primary focus is on Item 1."

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