Existing approaches to geoengineering have faced criticism, most notably on health grounds. It remains to be seen how much safer the particles might be https://www.economist.com/science-and-technology/2026/05/21/could-microscopic-spheres-of-silica-help-cool-the-planet?taid=6a0f51863caffb0001a362ef&utm_campaign=trueanthem&utm_medium=social&utm_source=voante