Read here. NASA's James Hansen has been fantastically wrong with his catastrophic climate predictions over the past decades, putting him in an exclusive league with the wildly and wrongly speculating Paul Ehrlich.
Just read the linked posting above and recognize that Hansen is supposedly the gold-standard of government scientists: hey, it's predictions based on absurdities, not science, and it's a gig he gets paid handsomely for.
Other failed-prediction postings.