Comment Ship wake bubbles is a good method (Score 3, Interesting) 319
See: http://www.bbc.com/news/scienc...
This method is great because ships are already making bubbles in their wake. We just make it whiter with smaller bubbles. Basically raising the ocean albedo.
In the "What can possibly go wrong?" department, this method is far better than any of the other geoengineering proposals. And it's cheap.
Simply retrofitting existing large ships to produce smaller bubbles could reduce global temperature by 0.5C. If we want more cooling, we could float dedicated solar-powered bot ships that do nothing but cruise the equitorial seas making wake.