Reasonable question . . .
1) I am rather certain that sulfur compound stratospheric injection is the option of choice for a quick fix on global warming if something had to be done right now. . . .
2) I think it was thoroughly considered and researched, computer modeled, and cost benefit analyzed by both Lawerence Livermore National Laboratories (LLNL) and Raytheon Corporation many years ago. . .
3) Persistent contrail and contrail induced cirrus cloud bank Non-Mitigation as well as the refusal to push down the maximum sulfur concentration of aviation fuels from 3,000 ppm to 10 ppm as is now proposed for ground transportation is somehow connected to the puzzle. . . .
4) There are several places on the planet where stratospheric sulfur geoengineering could be staged from. . . .
5) In the 2000s the amount of primarily Sulfur compounds was higher than expected in the stratosphere than expected according to NOAA and may have halted global warming for a few years . . . and the single most definitive satellite which may have Identified the source of sulfur aerosols in the atmosphere failed to deploy in 2011. . . . a Raytheon instrument package by-the-way. . . .
6) while I see from an aircraft industry point of view, the support of such a program may be more problematic than I first imagined . . . I still think it possible. . . just more difficult . . . Because the people I think could be responsible for geoengineering were and are probably the most intelligent, capable, connected, funded, and covert capable people the world has ever known. . . .