Apparently Frosty Hardiman thinks that it's Anti-American because it "blam[es] our nation -- the greatest nation ever to exist on this planet -- for global warming". Well, uh, it doesn't say that the US are the only ones on this planet who are emitting CO2, but it does paint a pretty grim picture of the American approach to the problem so far.
Hardiman managed to get it stopped because teachers have to obtain permission from the school board before they present "controversial" materials in their classes. I can't really imagine denying a teacher permission to show this particular (Oscar-Nominated) documentary.
Perhaps the issue of climate change is still under debate. I don't buy that, but even if I did, there would still be a benefit to showing the video - and discussing it. No kid is going to learn much if they're never allowed to question the status quo. Nevermind that the documentary is full of geography and showcases the beauty of our planet. And it introduces an important political figure in an accessible way.
Could he really, possibly, believe that his kids are probably better off watching stuff like American Idol?!