Science and Technology topics in news
Definition:
Stratospheric Aerosol Injection is a proposed form of geoengineering or climate intervention that aims to cool the Earth by injecting tiny reflective particles into the stratosphere to reflect a portion of incoming solar radiation.
Purpose:
To reduce global warming and mitigate the impact of climate change.
Inspired by natural events such as volcanic eruptions (e.g., Mt. Pinatubo, 1991), which released sulfur aerosols that temporarily cooled the Earth.
Mimics this effect by scattering solar radiation away from the Earth’s surface.
Process:
Fine aerosol particles are dispersed into the stratosphere (10–50 km altitude).
These particles form a reflective layer that reduces the amount of solar radiation reaching the troposphere, thereby cooling the Earth’s surface.
Materials Used:
Sulfur dioxide (SO₂) – most studied due to similarity with volcanic activity.
Calcium carbonate – proposed as a safer, less acidic alternative.
Salt particles – being considered due to their potential reflective properties.
Delivery Methods:
High-altitude aircraft
Balloons
Rockets
Artillery shells
High-altitude hoses
Advantages:
Potential for rapid temperature reduction.
Can act as a temporary measure while long-term emission reductions take effect.
May help reduce climate-related risks like extreme heatwaves or ice sheet melt.
Concerns & Challenges:
Uncertain side effects on weather patterns, ozone layer, and ecosystems.
Risk of uneven cooling across regions.
Moral hazard – may reduce urgency for cutting emissions.
Need for global governance to regulate its use and avoid geopolitical conflict.
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