On the Fact that as Predictions Go Farther Into the Future, the Margin of Error for Them Exponentially Grows (Factors Such as the State of the Economy, Climatic Events Unrelated to Humans, Wars Throughout the Planet, Scientific Breakthroughs, etc.) and so for Individuals to Say with Precision What the Weather Will Be In the 22nd Century Is Pure Comic Theater

 Now, how many of them actually believe what they're saying and acting in good faith (albeit delusionally), some I would say but not many.