I didn't watch the video cause I don't watch many videos, but putting "Bill Gates" in the title is done to get all the retards running in circles windmilling their arms. Yea, geoengineering is a thing, and a lot of solutions to fix the shitshow we've created on the planet are being considered, and one of the solutions is spraying the atmosphere to reduce heat. Whenever natural processes get subverted to achieve a goal, very careful thought has to be put into it, and that's what the pros are doing; given solutions very careful thought, while weighing risks.