Fiddling with the atmosphere

Fake volcanoes could combat global warming | COSMOS magazine

When it says "fake volcanoes" I'm not sure exactly what mechanism it suggests to get the sulfates into the high atmosphere. (I have suggested before nuking volcanoes that no one wants, but no one pays any attention to me!)

Anyway, the idea of deliberately polluting the high atmosphere to help fight global warming must horrify Greenies.