Mimics the cooling effects of a volcanic eruption by spraying shiny sulphur compounds into the high atmosphere.

But how do you simulate a phenomenon that is happening on us, with us, through the action of each of us as much as those of entire oceans and the high atmosphere?

And if geoengineering to alter earth's climate - for example, injecting sulfates into the high atmosphere - is to be an option, who would make the decision and undertake the operation?