I like to class myself in the rational crowd, and I think a major blind spot between sides is regarding the degree of warming. The following are further facts I think we can agree must be recognized if someone wants to be taken seriously:
1. The instrumental record over the last 125 years clearly shows things are warming.
2. CO2 in the atmosphere acts as a GHG and causes warming.
3. Human activity is dumping sizable quantities of CO2 into the environment and measurable amounts are accumulating in the atmosphere.
These are all well documented, measured and verifiable facts, not part of any honest debate.
That said, I STILL count myself a skeptic of the 'degree' or 'rate' of warming that we should be anticipating over the next decades. Having all the hottest years on record occurring in the last decade or two doesn't alarm me over much. We only have 100 some years of data, and the trend in it is a relatively linear warming from start to finish.
The point of contention is the question of whether or not we are facing 'catastrophic' change or not. Plenty of reconstructions and climate models argue for exponential warming. Such predictions go back to the very first IPCC report, which current global average temps are nearly cooler than the coolest error bars of predictions from back then. More recent estimates start the 'curve' later and later which has served to keep predictions consistent with measured reality. Despite this though, the best models all still DO recognize the absence of accelerated warming in recent years as a problem. They didn't predict it.
If anyone is still reading and thinks I'm missing important reasons to still anticipate catastrophic results, please let me know, but in all my searching of journals and actual, honest research I am just NOT finding any strong evidence or suggestion that it's time to 'panic'.