Stratospheric aerosol injection for controlling greenhouse gas emission

[Geoengineering News]

https://www.sciencedirect.com/science/article/abs/pii/B9780443192319000120

Authors

Muhammad Irfan, Muhammad Ali Musarat, Saba Ayub, Wesam Salah Alaloul

28 June 2025

https://doi.org/10.1016/B978-0-443-19231-9.00012-0

Abstract

An artificial method of injecting sulfate aerosols into the stratosphere to reduce greenhouse gas emissions (GHGs) is called stratospheric aerosol injection (SAI). By releasing sulfates into the atmosphere, volcanic eruptions naturally disperse sunlight and lower the temperature of the Earth’s surface. This technique attempts to replicate that process. SAI has drawn interest as a possible geoengineering technique to mitigate the effects of climate change. It does, however, present important ethical, technical, and environmental issues that need to be properly resolved before deployment is ever discussed. Regional climate alteration, ozone layer depletion, disruption of precipitation patterns, and negative health consequences on humans are among the possible dangers linked to solar radiation exposure. Concerns about consent, equity, governance frameworks, and unexpected repercussions are all included in the category of ethical considerations. Moreover, there are unknowns about the best injection heights and aerosol volume needed for efficient cooling while reducing additional hazards. To make informed judgments in the future regarding the sustainability and practicality of using SAI as a tool to reduce greenhouse gas emissions, it is imperative to have a thorough grasp of these intricate concerns. Therefore, the current chapter will analyze the concept of SAI and its anticipated benefits and challenges.

Source: ScienceDirect 

[Renaud de RICHTER]

"... using SAI as a tool to reduce greenhouse gas emissions" ???

Can some one explain how SAI reduces emissions of CO2, CH4, N2O and fluorocarbons?

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[Paul Stansell]

Hi Renaud,

The article itself does not seem to say that using SAI can "reduce greenhouse gas emissions", just the abstract in the email, and the abstract is not part of the article.

Paul

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[Anthony Strawa]

I can't understand how these comments get though the review process. They probably mean reducing the 'effects' of emissions.

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