“I find it hard to believe that computer models can accurately predict the weather centuries in advance, when they can’t even predict accurately the weather for next week.”
Global warming is a climatological phenomenon, not weather. Weather is short term, climate is long term. And there is still considerable debate on whether there really is global warming in the sense that it is artificially (human) generated. The problem is deducing whether increased carbon dioxide levels lead to the increase in average global temperature or whether they just happen to occur at about the same time. I’m still not sure what to believe, although there are some respectable climatologists who believe that global warming is not only real, but related to increased carbon dioxide generated by us.