There are major problems with most geo-engineering proposals. Any aluminum spray will poison crops and cause brain damage. All stratospheric blocking measures will affect crop photosynthesis (this study). As for marine cloud brightening, the biggest problem is the fact that they are still messing with nature, but it still presents a far-lower risk.

https://www.youtube.com/watch?v=N-o341c27uc&app=desktop&persist_app=1

Weather Modification History was created to inform the public of the extensive history of weather modification experiments. Our goal is to increase public awareness and debate about the moral and legal implications of today's multi-billion dollar weather control industry and the coming global governance of sunlight-blocking geoengineering schemes. This website will empower you to take action and raise awareness of the little known but lengthy history of weather modification and the men who dare attempt it.

https://weathermodificationhistory.com