Increasing concentrations of atmospheric CO2 cause warming. Sulphate aerosols and ash from volcanic eruptions cause cooling. This article is about a cooling event.
No hard evidence of that.
Besides, nowadays, man-made global warming caused by increasing CO2 levels are being blamed for taking us into the next ice age.
You did know, didn't you, that global warming causes temperatures to drop?
If you can make sense of that, let me know. The liberals have it figured out but no one else that I know of.