Well, here's the thing. You've got to take the best you've got. I'm not an expert, so I'm going to defer to those that are.
(This is not specifically to you, just a general response)
I'm reasonably scientifically literate, and I'm a fairly good problem solver. So are lots of people. The problem is, people can run through any random train of thought they want to reach some conclusion that sounds logical as hell, and still with no real background in what they're talking about, they can be wildly wrong because... big surprise... they don't actually know what they're talking about. While a lot of stuff sounds simple most things actually aren't.
So, if you don't know the background, you generally should not offer an opinion. Sure, in the west everyone thinks they're fully entitled to their opinion (maybe), and that their opinion is as valid as anyone else's (dead wrong). Seriously, you're just screwing everybody around you by taking respect in your analytical skill and offering an opinion. If a problem SEEMS simple to you, and you're wondering why the experts are so damn wrong... that's a warning sign not that there's some global conspiracy, but that you're missing some big part of the puzzle.
Really.. if there were huge holes in the science, you can bet a lot of scientists (not pundits or armchair theorists) would be screaming about it. Scientists aren't 100% going to get behind "protecting their interests" by towing a line.... if you're a scientist and you can offer credible reasons why most everyone else is full of crap, you're going to be set for life on funding from companies and organizations who REALLY want climate change to go away as a topic. The fact that the huge amount of money spent looking for problems in the science is only able to show results that are easily disputed as mistaken or cherry picking is telling. The science is looking reasonably solid to me on just that basis. At least, solid enough to be considering what can be done if it's right and doing something.
Of course the models are going to be inaccurate. A big part of the problem is the intuitive reaction for lots of otherwise quite rational people is to think "How can they know what the weather will be in 100 years when they can't even get next weekend's forecast right?"... and that becomes the core to their skepticism.
You have to actually look at the science, the feeds to the models, and the processes involved to understand there's probably something there. It's not the same type of forecasting.
To me, this is very much like saying "How can electronics possibly work if you idiots can't even predict exactly where an electron is going to be?" Guess what, you don't need to. Perfectly reasonable science can be built even if the discrete elements of that science are buried in uncertainty.