Road Map Published for Solar Geoengineering Research Decisions

A San Francisco-based nonprofit organization named Reflective has published a comprehensive roadmap detailing the necessary experiments, studies, and infrastructure required to make informed decisions regarding the deployment of solar geoengineering. Scientists have explored the concept of counteracting climate change by releasing reflective particles into the stratosphere for approximately fifty years, a technique known as stratospheric aerosol injection (SAI). This method aims to mimic the cooling effects observed after volcanic eruptions. Despite numerous studies on SAI, significant gaps persist in the scientific understanding of its efficacy and potential unintended consequences. Reflective's SAI Research Roadmap seeks to address this uncertainty by providing a systematic plan for research.

Dakota Gruener, cofounder and chief executive of Reflective, stated that the organization's mission is to provide the world with the data and tools essential for making timely, informed decisions about sunlight reflection technologies. Gruener expressed concern that global decision-making timelines for consequential actions might outpace the readiness of the current research system. The roadmap is intended to guide scientific endeavors and encourage philanthropies and government agencies to fund high-priority research, thereby responsibly accelerating the pace of scientific inquiry. The report estimates that a coordinated execution of all proposed work would take approximately a decade and cost around $370 million. Conversely, a less coordinated approach could extend the timeline to roughly twenty years and increase the cost to nearly $1.4 billion.

While Reflective does not advocate for the use of stratospheric aerosol injection, the report makes a case for conducting outdoor experiments. These experiments would involve the gradual release of increasing quantities of sulfur dioxide, or materials that convert into sulfur dioxide, into the stratosphere to observe the resulting atmospheric changes. This recommendation is considered controversial within the scientific community. The roadmap emphasizes the need for rigorous scientific investigation to understand the complex interactions and potential impacts of SAI on the Earth's climate system. It highlights the importance of interdisciplinary research involving atmospheric scientists, climate modelers, ecologists, and social scientists to fully assess the risks and benefits. The document also calls for the development of robust monitoring systems to track the effects of any potential SAI deployment. The publication of this roadmap signifies a critical step towards a more structured and evidence-based approach to evaluating a potentially transformative climate intervention strategy.