I think you're missing the point a little. Which is that for this to 'work' in any meaningful sense, it has to be scaled up to a planetary level of significant dispersion. This will almost certainly have consequences which we can't model, because of the scale. What does it mean to block out the sun across the whole planet? Photosynthesis on which we all rely to survive, needs sunlight. Even small changes can have dramatic effects on plant growth etc. It's a crazy idea, dreamed up by scientists who read too much science fiction.