The deployment of geoengineering technologies poses significant risks, including unpredictable changes to global and regional climates. The scientists caution that poorly understood interventions, such as stratospheric aerosol injections, could lead to rapid and uneven cooling, with potential temperature changes ranging from less than 1°C to as much as 3°C within a decade. These interventions could disrupt atmospheric and oceanic systems, leading to unintended consequences like altered rainfall patterns and increased climate variability. The lack of governance and oversight further exacerbates these risks, as private companies may proceed with deployment without addressing ethical, social, or environmental concerns. Vulnerable populations, particularly in regions already experiencing extreme weather events, could face heightened risks of heat stress, droughts, and storms.