You are on the same order of magnitude as CO2 without water vapor feedback. (judithcurry.com)
It is instead a surface water vapor feedback which adds additional surface warming on top of the usual things we talk about. (realclimate.org)
This occurs, in part, as a result of both the lower and upper atmospheric water vapor feedbacks, triggered by the increase in anthropogenic greenhouse gases. (pubs.giss.nasa.gov)