18.07.2018

# Media

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The Sydney Morning Herald: 'Truly scary': researcher wants to brighten clouds to rescue the Great Barrier Reef

"Dr Harrison is developing a technology known as “cloud brightening” – encouraging clouds over the reef to deflect more of the sun’s rays back into space, which would hopefully curb rising sea temperatures that cause coral bleaching."

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05.02.2018

# New Publications

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Keller, David P. (2018): Marine Climate Engineering

Keller, David P. (2018): Marine Climate Engineering. In Markus Salomon, Till Markus (Eds.): Handbook on Marine Environment Protection. Science, Impacts and Sustainable Management. 1st edition 2018. Cham: Springer International Publishing, pp. 261–276.

"In this chapter an overview is given of the proposed climate engineering methods that involve the direct manipulation of marine systems. This includes methods that enhance the ocean’s natural physical, chemical, and biological CO2 sequestration pathways, as well as purely technical ones that either use the ocean as a carbon storage reservoir or alter it’s properties to affect the Earth’s radiation budget."

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20.12.2017

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TEDx: We can control climate, but should we? The ethics of geoengineering

"More specifically, the talk focuses on Marine Cloud Brightening, an idea that explores the possibility of "brightening" clouds over the ocean to make them reflect more sunlight away from the Earth. David then encourages the audience to consider the implications of such a drastic and far-reaching solution to global warming, and whether we, as humans, have the right to intentionally perturb our Earth's natural climate systems."

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09.11.2017

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McClatchy: We can brighten clouds to reflect heat and reduce global warming. But should we?

"“We think SRN could buy time for other (carbon-reduction) measures to be put in place,” said Philip J. Rasch, chief climate scientist for the Pacific Northwest National Laboratory in Richland, Washington."

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08.11.2017

# New Publications

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Ahlm, Lars; et al. (2017): Marine cloud brightening – as effective without clouds

Ahlm, Lars; Jones, Andy; Stjern, Camilla W.; Muri, Helene; Kravitz, Ben; Kristjánsson, Jón Egill (2017): Marine cloud brightening – as effective without clouds. In Atmos. Chem. Phys 17 (21), pp. 13071–13087. DOI: 10.5194/acp-17-13071-2017.

"Here we present results from coordinated simulations with three Earth system models (ESMs) participating in the Geoengineering Model Intercomparison Project (GeoMIP) G4sea-salt experiment. Injection rates of accumulation-mode sea spray aerosol particles over ocean between 30° N and 30° S are set in each model to generate a global-mean effective radiative forcing (ERF) of −2.0 W m−2 at the top of the atmosphere. We find that the injection increases the cloud droplet number concentration in lower layers, reduces the cloud-top effective droplet radius, and increases the cloud optical depth over the injection area."

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17.10.2017

# New Publications

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Clingerman, Forrest; et al. (2017): Character and Religion in Climate Engineering

Clingerman, Forrest; O'Brien, Kevin J.; Ackerman, Thomas P. (2017): Character and Religion in Climate Engineering. In Issues in Science & Technology 34 (1).

"Here we seek to point out a useful but often-neglected conversation partner that can aid these discussions: religion. Religious traditions offer concepts and vocabularies for addressing ethics and policy. Religion is formatively influential for a majority of the world’s population, but is too often ignored in discussions of the social dimensions of climate engineering. Though we are not suggesting that all ethics and policy must “be religious,” we do argue that everyone (believers and nonbelievers alike) can profit from analyzing the distinctive moral and political ideas emerging from religious traditions and worldviews. In particular, we hold that religion is important to broaden the conversation to include the moral issue of character."

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28.08.2017

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University of Melbourne: The Great Barrier Reef is dying. Is it time to engineer the climate?

"In the absence of a sudden and rapid reduction in global greenhouse gas emissions, recovery options are few and tenuous.  In fact, that’s a generous assessment.  We have basically reached the point where anything that provides a glimmer of hope is “worth a crack”. One such proposal is to cool the ocean around the reef by “brightening” clouds overhead.  Modelling and measurements indicate that increasing cloud cover and density would reduce water temperatures around the reef, although whether the effect is sufficient to arrest coral bleaching is uncertain."

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19.08.2017

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the guardian: Silver linings: the climate scientist who records cloud behaviour

"Clouds cool the planet by reflecting solar energy back to space and also trap heat and radiate it back to Earth. In a Yale Environment 360 interview, physicist Kate Marvel discusses the double-edged effect clouds have on rising temperatures."

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17.08.2017

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Yale Environment 360: Investigating the Enigma of Clouds and Climate Change

"With geoengineering, I’m always very concerned because if I want to do an experiment on human subjects, as a university researcher, I have to go in front of a review board and convince them that all of my human subjects have given informed consent to participate in this experiment. And with a lot of geo-engineering experiments, I worry about how that consent is going to be obtained."

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07.08.2017

# Media

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Xinhua: To cool planet, researchers propose spraying particles into marine clouds

"A group of researchers at the University of Washington (UW) is investigating the idea of marine cloud brightening as a strategy to offset global warming. As a short-term measure for a possible future emergency situation, the strategy involves spraying saltwater into clouds above oceans to boost their capacity to reflect sunlight. In a paper published in the journal Earth's Future, two UW researchers, including lead author Rob Wood, a professor of atmospheric sciences, say small-scale tests of marine cloud brightening would also help answer scientific questions about clouds and aerosols' possible role to help cool the planet."

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