“They have predicted pretty much everything,....”
Well, no, they haven’t predicted anything good. Ever look at a map of Canada and how no one lives in most of it because of the cold? Imagine all the crops, the people that could live there, the flowing rivers of fresh water if it really got warmer.
They mention good stuff, but their sour world view doesn't let them see it. For example, whenever they complain about the Arctic ice melting, I always think about how much that would improve shipping.