One way that you can determine the fact from the fiction is whether or not the story is always changing. When someone creates a myth and start spreading it around, the story tends to change little by little until we hear something different every day. The global warming hoax is one of these myths that was created by someone looking to make a little extra cash. In order to keep things steady, the story needed to be changed to make it more believable as time when on. This is why we hear so many different sides to the story today and why it will keep changing as time goes on.