[Xirgil]

Sulphates have a cooling effect and drop out of the atmosphere. There was recently a push to remove the sulphate content in the fuel used for cargo ships from 3.5% to 0.5%, and as the sulphates dropped out of the upper atmosphere the water in the Atlantic warmed significantly. Turns out we had been unintentionally doing geoengineering that was counteracting some of the affects of climate change. The downside is that sulphates are deleterious to human health, causing asthma.

It's possible a sufficiently motivated billionaire or even a somewhat wealthy millionaire could independently finance a project to inject sulphates into the upper atmosphere in international waters and have a measurable impact on global warming, although people with respiratory issues might not be too happy.

[peteradio]

Rains out as acid rain.