It depends. The volcanic ash might be dark enough to - on balance - absorb heat, like the brown cloud over Southern Asia does. I'm not aware of work that's been

It depends. The volcanic ash might be dark enough to - on balance - absorb heat, like the brown cloud over Southern Asia does. I'm not aware of work that's been done on that. However, good point - hadn't thought of that. Maybe Gaia is swatting planes. :D