The National Academy of Sciences does Not contradict the film. It does have some reservations about the extent to which one of the graphs used in the film is interpeted.
As one critique of the film says "Science correspondent Harris agrees that the movie is effective, particularly in conveying the complexity of the issue. "It really does take an hour and a half to start to really understand global warming," Harris says.
He says Gore -- and the film -- get the "big picture" on climate change right. On some of the finer points, though, Harris says there is still scientific debate. And that sometimes isn't reflected as clearly in An Inconvenient Truth."
Check out these links for more on the issue:
www.npr.org/templates/story/story.php?storyId=5504563&ft=1&f=1007www.npr.org/templates/story/story.php?storyId=5428154