BS. The vast majority of the several thousand scientists who signed the UN paper blaming fossil fuel for global warming are not even climatologists, most of them are trained for and work in other scientific fields. You never hear anything in the media about the thousands of scientists, including many climatologists, who reject the man-made global warming theory, but they're out there just the same.
I read recently that 97% of all greenhouse gasses is water vapor, CO2 is only 1%, and man-made CO2 is only 1% of all CO2. I'm no scientist of any type, but I find it very difficult to believe that an almost infinitesimal increase in that 1/100 of 1/100 of all greenhouse gasses is enough to make a significant difference in the global climate one way or the other.
Water vapor is then a pollutant.