For clarity, water VAPOR is THE most active greenhouse gas and the most prevalent.
The atmosphere rapidly processes ‘excess’ water vapor via, well, clouds and rain. It’s the natural water cycle.
This volcano pushed out a lots of visible water, not vapor per se, because water vapor is not visible to the eye. A certain amount was certainly vapor (dry steam) and a lot of water, dirt and wet steam.
My take on this I that it’s bad science (10 years) and climate change/ hot earth crap.
Ban DHMO!