In order to ensure global coverage of their payload, the planes, looking more like firefighting tanker aircraft than commercial airliners, would take off from four different latitudes ― say runways in Houston, Manila, Brasilia and Johannesburg. On five-hour missions, they would seed the skies with blankets of clear, stinky, aerosolized sulfur dioxide gas. Dispersing 100,000 tons of SO2 annually over several years…”