For me, the big items he got wrong were pushing Mann's bogus curve and the giant floor to ceiling graph supposedly showing a correlation between temperature and CO2 from Antarctic ice core samples.
Mann's graph was specious from the beginning being based on two unrelated data sets. The actual temperatures from 2000 on clearly didn't follow the prediction from the graph.
The problem with the core sample based graph was that later analysis of core samples demonstrated that CO2 increases actually historically FOLLOWED increases in temperature by hundreds of years. Thus, they only demonstrated that increased temperatures "boiled" CO2 from sequestration; e.g. sea water. Thus, far from being the cause of increased temperature, increases of CO2 have been caused by increased temperature.
[[Gore was so wrong on many of the stipulations in his movie that many AGW proponents have disowned him so that they don’t have to defend him.]]
Which makes it very very puzzling as to why the president would give that man the time of day knowing full well that gore lied to push an agenda- the president should have simply treated them an like the charlatan that he is and ignored him completely-
For the most of prehistory that is true. But for the current increase in CO2 (120 ppm and rising) to be caused by warming there would need to be 12C or so of prior warming in the last 800 years or so. That did not happen. Therefore the rise in CO2 comes from something else. The vast majority of the cause is fossil. Some from recent decreases in vegetation. A very small amount from recent increases in volcanic activity. Fossil and cement making are the simplest explanation.