Colbert featured his Formidable Opponent segment last night and the topic of discussion was global warming. The debate got pretty heated between Colbert and himself when Al Gore decided to join in on the argument. Overall it was pretty entertaining and Gore himself was not too bad in the clip. The former Vice President is out and about promoting his new book "OUR CHOICE: A Plan To Solve the Climate Crisis" which was released on Tuesday. He not only appeared on the Colbert Report last night but was also interviewed by Jon Stewart on The Daily Show.