Oh so now the climate's really important to you?
I'll see your reasons for having a nicer climate and raise you 1 mass extinction. What's your plan for that, sprinkle hunger-suppressing drugs into the water?
If we're being responsible, it's not about choosing between cutting sunlight and cutting CO2 emissions, it's about CO2 cuts first and then maybe cutting sunlight. Just cutting sunlight and acting like it's fixing global warming is a joke (the punchline is mass extinction again! Hahaha!).
A good way to keep a few billion people from starving to death is to have a few billion less people in the future. We're starting to get population levels under control, so we're on the right path as long as we never, ever follow the advice of the nutball economists suggesting we should increase poopulation levels to keep their silly game running (I guess we need more unemployed people?).