25.07.2017

# New Publications

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Cao, Long; et al. (2017): Simultaneous stabilization of global temperature and precipitation through cocktail geoengineering

Cao, Long; Duan, Lei; Bala, Govindasamy; Caldeira, Ken (2017): Simultaneous stabilization of global temperature and precipitation through cocktail geoengineering. In Geophys. Res. Lett. 37 (D6), p. 117. DOI: 10.1002/2017GL074281.

"Here we investigate the possibility of stabilizing both global mean temperature and precipitation simultaneously by combining two geoengineering approaches: stratospheric sulfate aerosol increase (SAI) that deflects sunlight to space and cirrus cloud thinning (CCT) that enables more longwave radiation to escape to space."

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23.07.2017

# New Publications

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Fahrenkamp-Uppenbrink, Julia (2017): Geoengineering for temperature control

Fahrenkamp-Uppenbrink, Julia (2017): Geoengineering for temperature control. In: Science 357 (6348), 263.16-265. DOI: 10.1126/science.357.6348.263-p

Letter.

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22.07.2017

# New Publications

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Niemeier, Ulrike; Tilmes, Simone (2017): Sulfur injections for a cooler planet

Niemeier, Ulrike; Tilmes, Simone (2017): Sulfur injections for a cooler planet. In: Science (New York, N.Y.) 357 (6348), S. 246–248. DOI: 10.1126/science.aan3317.

"One suggested approach is the artificial reduction of sunlight reaching Earth's surface by increasing the reflectivity of Earth's surface or atmosphere."

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22.07.2017

# New Publications

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Lohmann, Ulrike; Gasparini, Blaž (2017): A cirrus cloud climate dial?

Lohmann, Ulrike; Gasparini, Blaž (2017): A cirrus cloud climate dial? In: Science (New York, N.Y.) 357 (6348), S. 248–249. DOI: 10.1126/science.aan3325.

"Climate engineering through cirrus cloud thinning, in contrast, mainly targets the long-wave radiation that is emitted from Earth."

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21.07.2017

# New Publications

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Moreno-Cruz, Juan B.; et al. (2017): An Economic Anatomy of Optimal Climate Policy

Moreno-Cruz, Juan B.; Wagner, Gernot; Keith, David W. (2017): An Economic Anatomy of Optimal Climate Policy. (HKS Faculty Research Working Paper Series, RWP17-028).

"This paper introduces geoengineering into an optimal control model of climate change economics. Together with mitigation and adaptation, carbon and solar geoengineering span the universe of possible climate policies. We show in the context of our model that: (i) a carbon tax is the optimal response to the unpriced carbon externality only if it equals the marginal cost of carbon geoengineering; (ii) the introduction of solar geoengineering leads to higher emissions yet lower temperatures, and, thus, increased welfare; and (iii) solar geoengineering, in effect, is a public goods version of adaptation that also lowers temperatures."

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21.07.2017

# New Publications

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Pasztor, Janos; et al. (2017): How to govern geoengineering?

Pasztor, Janos; Scharf, Cynthia; Schmidt, Kai-Uwe (2017): How to govern geoengineering? In: Science 357 (6348), S. 231. DOI: 10.1126/science.aan6794.

"The Paris Agreement aims to limit the global temperature rise to 1.5° to 2°C above preindustrial temperature, but achieving this goal requires much higher levels of mitigation than currently planned. This challenge has focused greater attention on climate geoengineering approaches, which intentionally alter Earth's climate system, as part of an overall response starting with radical mitigation. Yet it remains unclear how to govern research on, and potential deployment of, geoengineering technologies."

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20.07.2017

# New Publications

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Hansen, James; et al. (2017): Young people's burden. Requirement of negative CO2 emissions

Hansen, James; Sato, Makiko; Kharecha, Pushker; Schuckmann, Karina von; Beerling, David J.; Cao, Junji et al. (2017): Young people's burden. Requirement of negative CO2 emissions. In Earth Syst. Dynam. 8 (3), pp. 577–616. DOI: 10.5194/esd-8-577-2017

"Targets for limiting global warming thus, at minimum, should aim to avoid leaving global temperature at Eemian or higher levels for centuries. Such targets now require negative emissions, i.e., extraction of CO2 from the air. If phasedown of fossil fuel emissions begins soon, improved agricultural and forestry practices, including reforestation and steps to improve soil fertility and increase its carbon content, may provide much of the necessary CO2 extraction."

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18.07.2017

# New Publications

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Rau, Gregory H.; et al. (2017): Carbon Dioxide Removal: Size Matters

Rau, Gregory H.; Caldeira, Ken; Gattuso, Jean-Pierre; Greene, Charles H.; Karl, David M.; Leinen, Margaret et al. (2017): Carbon Dioxide Removal: Size Matters. In: Science.

Response to Field, Christopher B.; Mach, Katharine J. (2017): Rightsizing carbon dioxide removal.

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18.07.2017

# New Publications

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López Baucells, Adrià; et al. (2017): Climate engineering

López Baucells, Adrià; Robock, Alan; Trembath, Alex; Godin, Benoît; Hill, Christopher T.; Parson, Edward A. et al. (2017): Climate engineering. In Issues in Science and Technology XXXIII (4).

Forum debate.

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17.07.2017

# New Publications

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Visioni, Daniele; et al. (2017): Sulfate Geoengineering Impact on Methane Transport and Lifetime. Results from the Geoengineering Model Intercomparison Project (GeoMIP)

" Sulfate geoengineering, made by sustained injection of SO2 in the tropical lower stratosphere, may impact the CH4 abundance through several photochemical mechanisms affecting tropospheric OH and hence the methane lifetime."

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