Reply #9: This beggars description.

[bemildred]

It seems obvious that in seeking a causative factor, one should look at factors that change, that are changing. This fellow says its very hard to affect water vapor levels, one assumes because of the massive quantities present in the atmosphere already, and then decides to focus on it, looking for some one-shot event to "explain" the minute change in water vapor levels. This is the opposite of scientific investigation. Far more likely that heating would lead to more water vapor through evaporation than that some deus ex machina event would bootstrap us into warming. If one allows that some one-shot event might be responsible, which is certainly possible, then one is left to explain the other incidents of warming in climate similarly, or to explain why the catastrophic solution is particular to the current case. Just my 2c.