Researchers are turning their attention from climate models to the practical challenges of solar geoengineering, aiming to cool our planet with high-altitude aircraft and reflective materials.

The concept, inspired by volcanic eruptions, involves releasing particles into the stratosphere to reflect sunlight back into space. But the reality is far more complex than simulations can capture. Aircraft that could carry these payloads don’t exist, and we still have many questions about delivery mechanisms and potential side effects.

While some argue this research may eventually save lives by reducing extreme weather events, others fear it’s too dangerous to contemplate seriously. The risk of unforeseen consequences looms large, making the decision on whether to proceed a delicate balancing act.

Franke, from the University of Chicago, is working on detailed designs for geoengineering aircraft, arguing that models alone can’t answer key questions about this potential intervention. His work underscores the need for practical engineering solutions before we consider deploying these technologies.