The film may be off on its numbers, but I never assumed the counter was anything other than a gimmick to make a point anyway. The point, that Gore and many "environmentally aware" movie stars and other wealthy people spit far more than their share of CO2 into the air, still stands.

Al Gore apparently "atones" for his carbon production by donating to alternative energy projects:

The Gores and all the employees of Generation lead a "carbon-neutral" lifestyle, reducing their energy consumption when possible and purchasing so-called offsets available on newly emerging carbon markets. Gore says he and Tipper regularly calculate their home and business energy use - including the carbon cost of his prodigious global travel. Then he purchases offsets equal to the amount of carbon emissions they generate. Last year, for example, Gore and Tipper atoned for their estimated 1 million miles in global air travel by giving money to an Indian solar electric company and a Bulgarian hydroelectric project.