Well actually there is good evidence to suggest that we've warmed the planet by reducing emissions. Especially the sooty COAL type.
Seems that the soot was reducing the level of radiation reaching the ground back in the 1800's or so.
Then we cleaned up the power generating plants with scrubbers and stuff. The atmosphere cleared up and now we're warmed a bit.
No, I didn't make that up. But now I can't find the article. I think it was at TheStormWatch.org. Feel free to search.
A far-fetched conclusion could be that by launching particulate--assuming it would suspend, might cool things down a bit as it appears to have done in the recent past.
I doubt that the EPA police are any more numerous than the Border Enforcent officers. And this country is going to be destroyed by invasion much more quickly than by soot from pickup trucks.
Besides that, my "puller" passes emission testing everytime.
Put that in your smokeless pipe. :-laf