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Stratospheric aerosol injection 2025
June 12 , 2025
14 hrs 0 min
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- A Stratospheric Aerosol Injection (SAI) is a method in which aerosols are injected into the earth’s stratosphere to reduce the amount of sunlight reaching the surface.
- SAI aims to create a cooling effect that could help to combat the rising surface temperatures.
- It mimics the natural cooling effects observed after large volcanic eruptions, such as the 1991 eruption of Mount Pinatubo (Philippines).
- This eruption injected the sulfate aerosols into the stratosphere and temporarily lowered global temperatures by 0.5°C that year.
- SAI’s efficacy have focused on implementing it at 20 km or more, particularly over areas closer to the equator.
- The cooling effect will also be more pronounced in polar regions rather than in the tropics, where warming is more severe.
- If one country injects aerosols into the stratosphere, all countries will be affected and not always in a good way.
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