Who opposes solar geoengineering – and why?
Solar geoengineering is attracting growing attention as a possible response to climate change. Yet as interest in these speculative technologies grows, so too does opposition. Critics are often portrayed as fearful of innovation or insufficiently informed. Our recent research suggests otherwise. Across governments, civil society organizations, and academic networks, opposition to solar geoengineering is growing and is grounded in serious legal, political, ethical, and scientific concerns. We identify eight recurring rationales for rejecting the development and potential future use of these technologies, and we show how this opposition is increasingly coalescing around the language of “non-use”.
Who funds and who pays: The funding of solar geoengineering, 2020–2025
On October 24, 2025, Politico reported the Israeli-U.S. solar geoengineering startup Stardust Solutions would receive $60 million from Lowercarbon Capital and other Silicon Valley philanthropies and investment firms. This announcement renewed discussion about who funds solar geoengineering and who receives this funding. Scientists have long argued that researching these technologies may enable their use. Funding […]