Geoengineering: Why Cooling the Planet Is Harder Than It Seems

Geoengineering—the concept of artificially cooling the Earth by dispersing aerosols into the stratosphere—has long appeared to be a simple and accessible solution to climate challenges. However, real-world testing has revealed numerous engineering obstacles that demand revolutionary approaches.

The primary challenge is delivering materials to an altitude of about 20 km, where stable atmospheric conditions allow particles to spread across the planet. Existing methods, such as using balloons, are ineffective due to unpredictable trajectories and environmental risks. Specialized aircraft could serve as an alternative, but their development faces significant hurdles: the thin air at such altitudes requires fundamentally new aerodynamic solutions.

Iris Aero has proposed an aircraft concept with unusual proportions: massive wings on a compact fuselage, resembling a water strider’s limbs. Such a design is intended to ensure stability in the stratosphere, but its implementation will require substantial investment and testing.

Another critical issue is selecting the substance for dispersal. Volcanic eruptions have demonstrated that sulfuric acid can temporarily cool the planet, but its transportation and dispersal present technical difficulties. Researchers at the University of Chicago and other leading institutions are exploring alternative compounds that could be lighter and more effective.

Despite progress, geoengineering remains an experimental field with many unanswered questions. Without breakthrough technologies and international regulation, its large-scale application in the coming years is unlikely.