I'M SUPER DUPER CEREAL!! EXCELCIOR!!!
South Park's creators, Trey Parker and Matt Stone, don't believe in global warming and the episode "Manbearpig" is their way of saying that when Al Gore talks about the dangers of global warming he is getting all worked up over something that doesn't even exist.
"damn dude... that creature sure is one ugly man bear pig... how long til she eats some1?"