... but if you think, "hey, so the models could be wrong, how reassuring", think again. It's just as likely that reality is worse than predicted.
This cannot possibly be correct; it's the same reasoning as the argument "Either the sun will rise tomorrow or it won't. These two possibilities exhaust the entire space. Therefore, the odds of the sun rising tomorrow are 50%, one in two." The premises are completely correct -- and unrelated to the conclusion.