Question

The stratosphere specifically the lower stratosphere has it seems been drying out water vapour is a greenhouse gas

Answer 1

try it your self it is a easy answer i think you can d it try try but don't cry .....Bro

Answer 2

I guess the question is not clear but if you are asking whether water vapour contribute as a green house gas then your answer is no infact the gases like no2 and so2 mix with it and forms acid rain a kind of pollution