The fact that Al Gore is the guy promoting a movie intended to have political impact really ought to tell you something about the nature of the cause.  Like, that it is political in nature.  Not scientific.  Nothing has changed really, only this time he’s trying to use the "global warming" boogyman to force his way back into contention to make another run for office in 2008.  Scaring the heck out of the ignorant yokel voters it a tried and trued political tactic.  In this case using scary but fake "environmental" fears is one of the old hat standard tools used by the international Left to hammer The Market and wrest power from frightened and helpfully ignorant masses of citizens.  Its worked very well since the 1960’s so Al’s trotting it out into service again.  It doesn’t matter to Al that the Kyoto treaty he helped negotiate and wants us to sign won’t do much of anything at all to stop global warming even if he’s right that it is a real problem we are causing.  All that matters to Al is that he gets to use it to bludgeon his political opponents who know this and can be relied on to oppose it and thus give him a powerful political weapon to continue to use against them.

The proof is in the science, or rather is not in the science.  Al Gore’s movie is full of outright lies and distortions that is apparently making the actual true Climatologists in the world’s academic community pretty angry.  Go read the full article linked here for more detail, but here are a few choice quotes from actual scientists who are globally recognized experts on climate change (emphasis added):

Professor Bob Carter of the Marine Geophysical Laboratory at James Cook University, in Australia gives what, for many Canadians, is a surprising assessment: "Gore’s circumstantial arguments are so weak that they are pathetic. It is simply incredible that they, and his film, are commanding public attention."

But surely Carter is merely part of what most people regard as a tiny cadre of "climate change skeptics" who disagree with the "vast majority of scientists" Gore cites?

No; Carter is one of hundreds of highly qualified non-governmental, non-industry, non-lobby group climate experts who contest the hypothesis that human emissions of carbon dioxide (CO2) are causing significant global climate change. "Climate experts" is the operative term here. Why? Because what Gore’s "majority of scientists" think is immaterial when only a very small fraction of them actually work in the climate field.

…

Appearing before the Commons Committee on Environment and Sustainable Development last year, Carleton University paleoclimatologist Professor Tim Patterson testified, "There is no meaningful correlation between CO2 levels and Earth’s temperature over this [geologic] time frame. In fact, when CO2 levels were over ten times higher than they are now, about 450 million years ago, the planet was in the depths of the absolute coldest period in the last half billion years." Patterson asked the committee, "On the basis of this evidence, how could anyone still believe that the recent relatively small increase in CO2 levels would be the major cause of the past century’s modest warming?"

Patterson concluded his testimony by explaining what his research and "hundreds of other studies" reveal: on all time scales, there is very good correlation between Earth’s temperature and natural celestial phenomena such changes in the brightness of the Sun.

Dr. Boris Winterhalter, former marine researcher at the Geological Survey of Finland and professor in marine geology, University of Helsinki, takes apart Gore’s dramatic display of Antarctic glaciers collapsing into the sea. "The breaking glacier wall is a normally occurring phenomenon which is due to the normal advance of a glacier," says Winterhalter. "In Antarctica the temperature is low enough to prohibit melting of the ice front, so if the ice is grounded, it has to break off in beautiful ice cascades. If the water is deep enough icebergs will form."

…

But Karlén clarifies that the ‘mass balance’ of Antarctica is positive - more snow is accumulating than melting off. As a result, Ball explains, there is an increase in the ‘calving’ of icebergs as the ice dome of Antarctica is growing and flowing to the oceans. When Greenland and Antarctica are assessed together, "their mass balance is considered to possibly increase the sea level by 0.03 mm/year - not much of an effect," Karlén concludes.

There is more in the article, please go read it all .

The situation surrounding the global warming hype is really rather simple.  The global warming alarmists are not the experts in the field, and are not basing their arguments on real science.  Their arguments don’t hold up to a full examination of the data, ALL OF THE DATA, and their arguments have power only to those who are not provided with a full picture… like everyone seeing Al’s propagandist movie, his cynical attempt to recover his shattered political career.  Don’t be fooled.  And don’t let people you know repeat his lies without popping them like balloon by giving listeners the rest of the story.