What is Solar Radiation Modification (SRM) and why do we need to talk about its governance?
Solar Radiation Modification (SRM) aims to address a symptom-the temperature impact of climate change by reflecting sunlight back into space, or allowing more infrared radiation from Earth to escape, in order to reduce the Earth's temperature. It includes various different proposed techniques, many of which are not ready for deployment. SRM could not be a substitute for reducing greenhouse gas emissions or removing atmospheric CO₂, which must remain the primary effort of climate action. However, scientists have been exploring SRM techniques, such as Stratospheric Aerosol Injection (SAI), Marine Cloud Brightening, Cirrus Cloud Thinning, as well as land- and sea-surfaced based SRM methods and concluded that some have potential to offset warming and ameliorate some climate hazards.
However, if they were to be implemented, SRM would introduce a range of new risks to people and ecosystems. These risks are not well understood and could for example, exacerbate global inequality, poverty, peace and security and have serious implications for delivery of the Sustainable Development Goals (SDGs). Of course, climate change itself poses serious risks, and hence one must assess the risks of using SRM as well as the risks of not using it.
Awareness of SRM both within global policy circles and among the general public is low but growing as the likelihood of overshooting the Paris temperature goals of 1.5-2°C becomes more evident. Perhaps more than any other potential climate change response option, the choice of whether or not to research, develop or even one day deploy SRM (e.g., SAI) would affect for better or worse-everyone on the planet. Decisions made in the next few years on how to govern SAI may lock in these decisions for decades and constrain options available to future generations.
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