My response would have been: “Seriously – Al Gore and the 2000 election? With everything going on in the world right now, that’s what you want to talk about?”
There are far too many people (on both sides) for whom politics does not consist of discussion of government and law an economics, but is instead a comic book with good guys and bad guys. So no, sorry, your personal distaste for Al Gore does not actually mean global warming is something he made up.