Geoengineering would hurt some people. Global warming is good for some of us in the northern climates because it is giving us a longer growing season.
Note I'm not arguing about if it exists, but the reality is climate changed is a mixed bag that hurts some people and benefits other people depending on where you are. There are scientific papers about this. Thus any geoengineering to reverse climate change will also hurt some people and benefit others.
A better idea would be to focus on the real problems such as pollution, reducing waste, war, etc.