Rainmaker uses drones to seed clouds with silver iodide

San Francisco startup Rainmaker ran a cloud-seeding experiment over Homer, Alaska, claiming it produced 19 million US gallons of water in three hours. The company disperses 20 grams of silver iodide per drone flight, while environmental groups demand monitoring of its impact.

• Rainmaker claimed 19 million gallons of water in three hours over Alaska
• Drones release 20 grams of silver iodide per flight
• Cloud seeding adds only 5–10% precipitation under ideal conditions
• Recast Systems is testing a biodegradable protein seeding agent instead of silver iodide