This was the most surprising thing we discovered, it's the wild west. The closest thing we found was https://2009-2017.state.gov/t/isn/4783.htm. We're not hostile, we come in peace.
I very very much doubt this can't be shut down by some environmental agency, if they only care to look. Even if there is no specific law about it, you can't normally just release stuff into the shared environment - you have to have some kind of dispensation for it (like the oil and coal industries unfortunately have for their own pollution, for example).
Launching sulfur into the stratosphere with the noble goal of increasing Earth's albedo might sound good locally but you don't seem to have applied any systems theory or scientific experiments to understand what complex interactions your actions might generate. The atmosphere is not a simple system, your actions might have very unintended consequences and you don't even seem phased by that...
Bearing gifts of free blankets!
Many have tried to trace down some proof of this happening, but no one has been able to do it. Others have tried to figure out where the anti-American underground that Zinn drew from came up with the idea, and the best they could find is a letter from a British military official speculating that this is something the UK should do to the Indians in their North American colony. But there is no evidence this idea was ever implemented, by the UK or anyone else.
Some lefty professor found the letter, concluded it happened, then during the retelling in various anti-american teach-ins and seminars, this changed from British doing it during the colonial era to the US doing it, time shifted to the civil war era in the wild west. But it never happened. It is one of many fabricated events in "People's History", but to be fair, Zinn didn't make it up, he just collected all the various unsourced rumors circulating in the underground at the time and decided to publish them as fact.
> I sure hope you know your history.
Indeed.
At a guess: nobody thought to make a law against it yet and/or nobody with power has yet tried to apply an existing law to it.