The best method for delivering aerosols would probably be via airplane. The plane would need to be capable of reaching an altitude of around sixty thousand feet and of carrying a payload on the order of twenty tons. Researchers who looked into the configuration of such a craft, which they dubbed a Stratospheric Aerosol Injection Lofter, or SAIL, concluded that development costs would run to about $2.5 billion. This may sound like a lot of money, but it’s only about a tenth of what Airbus spent to develop its “superjumbo” A380, a plane it stopped producing after a dozen years.
