Conspiracy theories fuel state efforts to ban geoengineering

By Chelsea Harvey | 04/10/2025 06:14 AM EDT

Far-right and anti-vaccine groups are part of a push in dozens of states to prohibit the theoretical climate change fix of blocking the sun’s rays.

The sun sets behind the clouds in Berlin's Kreuzberg district on March 25, 2024.

The sun sets behind the clouds in Berlin's Kreuzberg district on March 25, 2024. David Gannon/AFP via Getty Images

Lawmakers in at least 25 states have introduced legislation to ban a controversial climate intervention known as solar geoengineering.

The technology, which involves spraying reflective materials into the atmosphere to block sunlight, is unproven and risky. But some researchers argue that the practice deserves more scientific investigation, especially as global temperatures continue to rise.

A new spate of legislation threatens to kneecap those efforts before they even begin. And many of the bills are rooted in conspiracy theories based on bogus science or linked to far-right groups that challenge mainstream science, experts said Wednesday at a panel hosted by geoengineering knowledge nonprofit SRM360.

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The bills’ supporters are “the same sort of folks who, generally speaking, are engaged in chemtrail and anti-vax discussions,” said Craig Segall, an environmental policy consultant and former deputy executive officer and assistant chief counsel of the California Air Resources Board. “So that’s the center of gravity for this at the moment.”

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