Wouldn't that cause acid rain? Geez you can't make these people happy...
When I started reading the article, I thought they were going to suggest putting mirrors on top of all automobiles, so as to reflect the sunlight right back into space.
All in all, I like that idea better than sulfurizing the stratosphere.
Perhaps it would be cheaper just to retart a known sulfuric volcanic area with a nuke, and let Mother Nature do the rest?