Who Gets to Block the Sun?

"Stardust Solutions, an American-Israeli company planning to build a solar-reflecting system in the next few years, has enough fans that it raised $60 million in 2025."

"For years, solar-geoengineering research has focused on sulfate aerosols that effectively mimic the impact of volcanic eruptions, but Stardust claims to have invented a unique particle that avoids those issues."

"The first is four pages of 'guiding principles,' explaining why the company sees research into solar-radiation modification, or SRM, as essential."

"Neither document addresses the two key questions facing this initiative: What kind of particle does Stardust want to inject into the atmosphere, and why should a private company be trusted to control a planet-altering technology?"

Stardust Solutions, a private geoengineering start-up, plans to create a solar-reflecting system to cool the planet. The company raised $60 million in 2025, despite skepticism from scientists and concerns about security risks. Stardust claims to have developed a unique particle that avoids the issues associated with traditional sulfate aerosols. The company plans to release documents outlining its guiding principles and a framework for safe deployment, but key questions remain unanswered regarding the particles used and trust in a private entity managing such technology.

Read at The Atlantic