It's depressing to think that when that documentary came out, the general reaction of the public was ambivalence to outright laughter. Al Gore really was a visionary, even if he was 30 years late compared to the climate scientists.
That movie was nothing more than modern day, “the end is nigh” doomsaying. Is man made global warming real? Almost certainly, but it’s hard to call a documentary visionary when basically none of its predictions have panned out.