A geoengineering company would use tiny specks of silica to block sun rays — and make billions of dollars.

💾

© Ye Aung Thu/AFP via Getty Images

Dozens of startups working on data centers, mining and pharmaceuticals are hanging on Elon Musk's long-stalled megarocket.

© Eric Gay/AP

Traders are placing wagers on the likelihood of disasters, activists being jailed and oil depots exploding.

© Gerald Herbert/AP

Rainmaker Technology is spending hundreds of thousands of dollars on lobbying and gold-framed Metro ads in a play for national attention.

© Rainmaker

Investment firms have put over $100 million into developing risky technologies that could cool the planet with unknown side effects.

💾

© David Gray/AFP via Getty Images