As Earth faces its hottest temperatures on record and struggles to mitigate climate change, scientists are exploring an unconventional solution: deploying a giant sunshade in outer space. This sunshade, akin to a massive beach umbrella, would intercept a fraction of solar radiation, sufficiently cooling the planet to counteract global warming. While the concept of sunshades has been discussed for years, recent interest has surged amid worsening climate conditions. Various proposals, including scattering dust into space and tethering shades to asteroids, are being explored. Now, a team led by Yoram Rozen from the Asher Space Research Institute at Technion-Israel Institute of Technology plans to build a prototype shade to demonstrate its feasibility. Despite the potential benefits, critics argue that sunshades are astronomically expensive and could pose risks such as damage from space debris. However, proponents contend that given the urgency of climate change, all viable solutions must be considered. The Technion model involves deploying lightweight solar sails affixed to a small satellite, with a prototype expected within three years pending funding. While the full-scale version would carry a significant price tag, proponents argue it is a worthwhile investment compared to the cost of climate-related damage. Ultimately, the aim is not to solely rely on sunshades but to complement other mitigation efforts while demonstrating the feasibility of this innovative approach.

https://www.nytimes.com/2024/02/02/climate/sun-shade-climate-geoengineering.html