1) The reference to Al Gore is relevant. Al Gore is a primary shareholder in some of the companies that have been formed to trade carbon credits. Needless to say, it creates a conflict of interest which ought to cause people to think a little more carefully about what he has to say.
2) Al Gore after his movie and various environmental statements should be an example of good environmental behavior rather than the opposite -- especially if he truly believes it. Additionally, it is fair to assume he has seen data that most of us have not and would adjust his behavior accordingly.
3) It doesn't matter whether a conservative author said it or whether it was said by Pol Pot. It is true or it is not. Giving credit to the author of a statement is the right thing to do no matter who said it. Ad homonym attacks are just plain dumb.