Yes I mean an artificial volcano that emits sulfates like natural volcanos for solar radiation managment. I'm not sure what aerosol would be best, and I think a lot of people are looking into that. I think with sulfate aerosols one wouldn't produce too much acid rain, but still it would probably be better to use another aerosol if possible. The biggest problems are acid rain and ozone depletion, but other strategies, including the reduction of greenhouse gases have their own problem too including the amount of time and money it will take to change all the infrastructure. A short-term solution