The reality of global warming
The real problem here is that you are all arguing about the details. In a way Lewis Page is perfectly correct to treat the wide range of global warming fanatics with a degree of skepticism. The vast majority of "information" posted by both sides of the debate is at best meaningless crud but more typically distortion based upon prejudice. What currently gets categorized as global warming science is actually the equivalent of weather forecasting but without the short-term feedback for quality control that weather gives you. You find out about 5 day weather forecasting every 5 days. Attempts to forecast climate change details are going to be very difficult and fraught with error.
What this means is that we don't know exactly what will happen or exactly when. This doesn't mean we know it won't happen, which is the typical anti-warming argument. To use an analogy, we are trying to work out whether it is safe to cross the road in thick fog. We can't see through the fog despite the best attempts of current science but we do have a more general theory that is solidly based that says traffic is coming. The warming fanatics are saying we are about to be run over, the anti-warming fanatics are saying that its safe to cross if you can't see anything coming. They are both wrong but I but caution seems more sensible than the gung -ho 'of course its safe' attitude.
The real global warming science is based on sound Geological analysis and a broad confidence that if we keep pumping CO2 into the atmosphere than it will get a lot warmer and sea level will rise and it will make a pretty big impact on human civilisation.
For a good real issue with the predictive science element of the global warming story the best current example is the realisation that the models haven't correctly considered the impact of a reduced equatorial - polar temperature gradient and its impact on the jet stream and the apparent real consequences already seen for weather in the mid-latitudes. This is a perfect illustration of the weaknesses of current modelling and the desperate need to penetrate that fog and find out what is going to happen.
We really don't know how scared we should be. The "it will never happen" brigade should perhaps be compared with the opposite extreme of some of the earlier predictions from James Lovelock of Gaia hypothesis fame (who has since changed his mind). These represent the extreme positions