24.10.2018

# New Publications

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Soldatenko, S. A.; et al. (2018): Optimal Control of Aerosol Emissions into the Stratosphere to Stabilize the Earth’s Climate

Soldatenko, S. A.; Yusupov, R. M. (2018): Optimal Control of Aerosol Emissions into the Stratosphere to Stabilize the Earth’s Climate. In: Izvestiya Atmospheric and Oceanic Physics 54 (5), S. 480–486. DOI: 10.1134/S0001433818050122.

"The problem of the optimal control of aerosol emissions into the stratosphere to stabilize the Earth’s climate is considered based on the zero-dimensional energy balance model. The global surface-temperature deviation from the undisturbed value is the state variable, and the albedo of the artificial aerosol layer, whose time variations are functionally related to the change in the total mass of aerosol particles and, consequently, the rate of their emissions, is the control variable."

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08.10.2018

# Media

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Welt: "The life won't be the same." German

German article on CE.

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07.09.2018

# New Publications

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Li, Y.; et al. (2018): Climate model shows large-scale wind and solar farms in the Sahara increase rain and vegetation

Li, Y.; Kalnay, E.; Motesharrei, S.; Rivas, J.; Kucharski, F.; Kirk-Davidoff, D. et al. (2018): Climate model shows large-scale wind and solar farms in the Sahara increase rain and vegetation. In: Science 361 (6406), S. 1019–1022. DOI: 10.1126/science.aar5629.

"In this study, we used a climate model with dynamic vegetation to show that large-scale installations of wind and solar farms covering the Sahara lead to a local temperature increase and more than a twofold precipitation increase, especially in the Sahel, through increased surface friction and reduced albedo. The resulting increase in vegetation further enhances precipitation, creating a positive albedo–precipitation–vegetation feedback that contributes ~80% of the precipitation increase for wind farms. This local enhancement is scale dependent and is particular to the Sahara, with small impacts in other deserts."

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03.09.2018

# New Publications

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Rautiainen, A.; et al. (2018): Market-Level Implications of Regulating Forest Carbon Storage and Albedo for Climate Change Mitigation

Rautiainen, A.; Lintunen, J.; Uusivuori, J. (2018): Market-Level Implications of Regulating Forest Carbon Storage and Albedo for Climate Change Mitigation. In: Agric. Resour. Econom. Rev. 26, S. 1–33. DOI: 10.1017/age.2018.8.

"We numerically assess the policy’s market-level impacts on land allocation, harvests, and climate forcing, and evaluate how parameter choices (albedo strength, productivity of forest land, and carbon and albedo prices) affect the outcomes. Carbon pricing alone leads to an overprovision of climate benefits at the expense of food and timber production. Complementing the policy with albedo pricing reduces these welfare losses."

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04.08.2018

# New Publications

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Werner, C.; et al. (2018): Biogeochemical potential of biomass pyrolysis systems for limiting global warming to 1.5 °C

Werner, C.; Schmidt, H-P; Gerten, D.; Lucht, W.; Kammann, C. (2018): Biogeochemical potential of biomass pyrolysis systems for limiting global warming to 1.5 °C. In: Environ. Res. Lett. 13 (4), S. 44036. DOI: 10.1088/1748-9326/aabb0e.

"Our results show that meeting the 1.5 °C goal through mitigation strategies including large-scale NE with plantation-based PyCCS may require conversion of natural vegetation to biomass plantations in the order of 133–3280 Mha globally, depending on the applied technology and the NE demand. Advancing towards additional bio-oil sequestration reduces land demand considerably by potentially up to 60%, while the benefits from yield increases account for another 3%–38% reduction (equalling 82–362 Mha). However, when mitigation commitments are increased by high balancing claims, even the most advanced PyCCS technologies and biochar-mediated co-benefits cannot compensate for delayed action towards phasing-out fossil fuels."

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30.07.2018

# Media

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Cosmos: 6 ways geoengineering could fight climate change

"Some researchers think massive engineering projects might help slow global warming. Other scientists aren’t so sure. Stephen Fleischfresser surveys the top six proposals."

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08.07.2017

# Media

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New York Times: California Today: A Plan to Cool Down L.A.

"That’s why Los Angeles is pushing a novel plan to cool down the city: Turn the streets a different color. The idea of “cool pavements” has been kicking around City Hall for years, but only recently has it resulted in action on the ground. Matt Peterson, Los Angeles’s chief sustainability officer, said test applications of a light gray coating known as CoolSeal had shown a 10-degree reduction in heat gain."

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20.08.2016

# New Publications

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Kreidenweis, Ulrich; et al. (2016): Afforestation to mitigate climate change. Impacts on food prices under consideration of albedo effects

Kreidenweis, Ulrich; Humpenöder, Florian; Stevanović, Miodrag; Bodirsky, Benjamin Leon; Kriegler, Elmar; Lotze-Campen, Hermann; Popp, Alexander (2016): Afforestation to mitigate climate change. Impacts on food prices under consideration of albedo effects. In Environ. Res. Lett. 11 (8), p. 85001–85001. DOI 10.1088/1748-9326/11/8/085001

"We assessed the food price response of afforestation, and considered the albedo effect with scenarios in which afforestation was restricted to certain latitudinal zones. In our study, afforestation was incentivized by a globally uniform reward for carbon uptake in the terrestrial biosphere. This resulted in large-scale afforestation (2580 Mha globally) and substantial carbon sequestration (860 GtCO2) up to the end of the century."

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18.04.2016

# New Publications

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Mengis, Nadine; et al. (2016): Assessing climate impacts and risks of ocean albedo modification in the Arctic

Mengis, Nadine; Martin, T.; Keller, David P.; Oschlies, Andreas (2016): Assessing climate impacts and risks of ocean albedo modification in the Arctic. In J. Geophys. Res. Oceans. DOI 10.1002/2015JC011433.

"This study assesses climate impacts and risks of idealized Arctic Ocean albedo modification (AOAM), a proposed climate engineering method, during transient climate change simulations with varying representative concentration pathway (RCP) scenarios. We find no potential for reversing trends in all assessed Arctic climate metrics under increasing atmospheric CO2 concentrations."

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20.08.2015

# New Publications

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Bozzi, E.; et al. (2015): Mimicking biochar-albedo feedback in complex Mediterranean agricultural landscapes

Bozzi, E.; Genesio, L.; Toscano, P.; Pieri, M.; Miglietta, F. (2015): Mimicking biochar-albedo feedback in complex Mediterranean agricultural landscapes. In Environ. Res. Lett. 10 (8), p. 84014–84014. DOI 10.1088/1748-9326/10/8/084014

"However, some side effects of large-scale biochar application need to be investigated. In particular a massive use of a low-reflecting material on large cropland areas may impact the climate via changes in surface albedo. Twelve years of MODIS-derived albedo data were analysed for three pairs of selected agricultural sites in central Italy."

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