Risks are minimal.
Harvey ’18 [Chelsea; May 23; Environmental Reporter; Scientific American, “World Needs to Set Rules for Geoengineering Experiments, Experts Say,” https://www.scientificamerican.com/article/world-needs-to-set-rules-for-geoengineering-experiments-experts-say/]
Some scientists are concerned that there could risks associated with solar geoengineering—unintended effects on the weather, for instance, or damage to the planet’s protective ozone layer. Because most research on solar geoengineering has been restricted to modeling studies, there’s disagreement among experts about the possibility, or seriousness, of these potential side effects. Keith, himself a specialist on solar geoengineering, believes the science so far suggests these risks are “small.” He and other Harvard scientists, including atmospheric chemistry expert Frank Keutsch, are planning a series of small-scale field . It’s the first of their kind, and the researchers hope they will provide more information on the physical behavior of aerosols in the atmosphere. These experiments may have sparked some of the discussion around the need for geoengineering governance. While small-scale tests likely carry little risk, they’ve introduced the idea that solar geoengineering may be moving from theory to reality.