I must admit that i am a lay man and i wasnt very convinced by the inconvenient truth (as i felt the trends were projected only over the last 50 years in comparison to earth's history !!)
However i am not very convinced by your argument too.
citing other unrelated historical theories gone wrong does not suggest anything at all.

closest i came to a good skeptic argument was a meterologist who wrote in "The Guardian". In his view, weather trends are well within acceptable statistical error limits and felt that alarmists dont have much of a case

In fact, one of the worries as i have seen it is very few weather/meterological experts seem to be in the forefront of global warming message