They can’t predict 4 hours out.
Why should anyone believe they can predict 100 and 200 years out?
My wife and I went to a lecture at the Boston Museum of Science back around 2000, I think, where they had some bigwig from the National Weather Service talking about computer models, and how in 3-5 years, they would be able to predict weather down to city block size areas up to two weeks in advance with high accuracy.
I think of that often, and there is one word it brings to mind every time: Hubris.