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How Sulphates Cool The Planet
- Sulphur dioxide in the stratosphere forms sulphuric acid droplets that reflect sunlight and cool the planet for a few years.
- Stephenson emphasizes this mechanism as the scientific basis for solar geoengineering proposals.
Geoengineering Is A Tourniquet
- Atmospheric CO2 keeps rising and will remain elevated for a million years unless actively removed at scale.
- Stephenson warns that solar geoengineering can be a temporary tourniquet while huge carbon removal projects are built.
Prepare For Early, Unilateral Deployment
- Expect solar geoengineering to be considered when climate disasters cause mass fatalities, not just in academic debate.
- Recognize that deployment may begin with unilateral actors or governments rather than multilateral consensus.