Current volcanic activity is difficult to quantify, too, when considering how it affects climate.
The skeptical science link contains the title, 'Water Vapour as a Positive Feedback'. It mentions nothing about how water vapour also has a -ve feedback loop.
Here's what the other link says about the -ve feedback:
Water is the air conditioner of the planet. It not only keeps the surface cooler (albeit at the expense of making it moister) but rain also washes a lot of pollution out of the atmosphere to everyone’s benefit.
The sum of the +ve and -ve feedbacks is dynamic and chaotic. It is uncertain.
