f11f2692_limate_Science___ThinkProgress__One_Liner
[0] 33 [Skeptic Argument] “Water vapor is the most powerful greenhouse gas” [Paragraph] Water vapour is the most dominant greenhouse gas. Water vapour is also the dominant positive feedback in our climate system and amplifies any warming caused by changes in atmospheric CO2. This positive feedback is why climate is so sensitive to CO2 warming. [One Liner] 
Rising CO2 increases atmospheric water vapor, which makes global warming much worse.
99 One-Liners Rebutting Denier Talking Points — With Links To The Full Climate Science | ThinkProgress
One Liner