Rickels, W.; Merk, C.; Reith, F.; Keller, D.; Oschlies, A. (2019): (Mis)conceptions about modelling of negative emissions technologies. In: Environ. Res. Lett.

"Intentionally removing carbon from the atmosphere with negative emission technologies (NETs) will be important to achieve net-zero emissions by mid-century and to limit global warming to 2°C or even 1.5°C (IPCC, 2018). [...] Here, we show the results from an anonymous expert survey, including 32 Earth-System-Model (ESM) experts and 18 Integrated-Assessment-Model (IAM) experts, about the role of NETs in future climate policies and about how well the various technologies are represented in current models. We find that they strongly support the view that technology portfolios are requires to achieve negative emissions, however, the responses show that the number and range of NETs that can be assessed in IAMs is small and that IAMs and ESMs are rather applied to analyze technologies separately than in combination."

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"The plan sounds like science fiction — but could be fact within a decade; every day more than 800 giant aircraft would lift millions of tonnes of chalk dust to a height of 12 miles above the Earth's surface and then sprinkle the lot high around the stratosphere. In theory, the airborne dust would create a gigantic sunshade, reflecting some of the Sun's rays and heat back into space, dimming those that get through and so protecting Earth from the worsening ravages of climate warming."

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The newsletter of calendar week 33 in 2019 is now available here.

Duan, L.; Cao, L.; Bala, G.; Caldeira, K. (2019): Climate Response to Pulse Versus Sustained Stratospheric Aerosol Forcing. In: Geophys. Res. Lett., S. 1. DOI: 10.1029/2019GL083701.

"Solar geoengineering has been suggested as a potential means to counteract anthropogenic warming. Major volcanic eruptions have been used as natural analogues to large‐scale deployments of stratospheric aerosol geoengineering, yet difference in climate responses to these forcings remains unclear."

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