There are many kinds of truth. Al Gore was poleaxed by an inconvenient one yesterday.

In his speech, Mr Gore told the conference: “These figures are fresh. Some of the models suggest to Dr [Wieslav] Maslowski that there is a 75 per cent chance that the entire north polar ice cap, during the summer months, could be completely ice-free within five to seven years.”
Inconvenient truth for Al Gore as his North Pole sums don't add up - Times Online