[aeroman]

Some of the side effects are common to all kinds of solar radiation management (SRM) - geoengineering that makes the Earth more reflective in some way or another.

Greenhouse gases absorb infrared radiation emitted by the Earth and heat the atmosphere as well as the surface. SRM geoengineering just changes how much energy the Earth absorbs from the sun (which has the strongest effect at the surface).

If GHGs increase, but you use SRM to keep the surface temperature fixed, you still end up heating the atmosphere. This means in a geoengineered world, you have less rain.

A reduction in rain might be more important to some countries than others - not everyone would want the same amount of geoengineering.