What do global warming skeptics not accept?

All of those have a grain of truth in them. The problem is the fact that the computer models the climatologists are using don't even factor in how clouds effect the planet. And most likely don't even have Sun Spot Cycle worked into the modeling software. Not only that this is a new profession, plus they've only been tracking global temperatures for a little over 100 years. That in itself is a drop in the bucket when it comes to how old our planet is. The scientists have also been tweaking the data to fit their paradigms and not allowing the data they do have speak for itself.