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Geoengineers Propose Freezing Water Vapor to Stop Global Warming - Boing Boing

"Geoengineers have a bold new idea in the battle to slow climate change. According to Gizmodo, water vapor trapped 4 to 50 miles above earth acts as a greenhouse gas. Joshua Schwarz, researcher at National Oceanic and Atmospheric Administration's Earth System Research Laboratory, believes that water vapor could be reduced by adding ice-forming nuclei to the atmosphere.

Removing just 3% of the water mass through freezing could have positive global effects. The strategy is in its early stages, and many technical difficulties lie ahead, but there are positive results from models based on NASA research to track the movement of vapor into the upper atmosphere"
https://boingboing.net/2024/03/22/geoengineers-propose-freezing-high-altitude-water-vapor-to-slow-climate-change.html