“Known” Chemicals used in Geoengineering: Aluminum Oxide, Thorium Oxide, Silver Iodide, liquid propane, Carbon Dioxide, Ammonia Nitrate, Urea, Welsback materials, Refractory materials, Industrial Particles, dry ice, salts. United States Patent 5,003,186 Chang , et al. March 26, 1991 Stratospheric Welsbach seeding for reduction of global warming Military Weather Modification: Planetary Weapons and Military Weather Modification: