It is a bit like the "J" curve, they used the data from a weather station that had been effected by recent otherside influences to produce the curve, it doesn't give much creds to their story.

>"It goes without saying that climate realists around the world believe Nobel Laureate Al Gore used false information throughout his schlockumentary "An Inconvenient Truth" in order to generate global warming hysteria.
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>On Friday, it was revealed by ABC News that one of the famous shots of supposed Antarctic ice shelves in the film was actually a computer-generated image from the 2004 science fiction blockbuster The Day After Tomorrow."
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>http://newsbusters.org/node/20680?q=blogs/noel-sheppard/2008/04/22/abc-s-20-20-gore-used-fictional-film-clip-inconvenient-truth