someone else wrote:History is not replete with "outliers". It is replete with concensus that was dead wrong. Bloodletting, anyone? Geocentrism? What makes you think our culture is so much better? There are a number of factors that can influence a consensus, and this should never be the basis for truth.
Bloodletting and geocentrism both fell before the might of the scientific method. Our culture is better because we are willing to test and compare; our culture is better precisely because we don't think we're right, while they were wrong precisely because they thought they were right.
No one, literally no one, doesn't believe in global warming. It's psychologically impossible, to the same extent that I cannot convince myself that red is blue, no matter how hard I try. Why? Because all our data points indicate global warming. You can't argue with the recording of temperature over the last 100+ years that demonstrates a decisive if fluctuating increase in temperature. Fact cannot be disagreed with or not believed in. If you can go back and disprove those temperature measurements, then fact is different than what we thought, and I can no longer argue with you; that's fine.
Anyway, people can't disbelieve global warming. All they can disbelieve is that humans have caused it, and that is open to debate. We have far too little information one way or the other to determine if we're the cause. No one can be sure of our causal efficacy, exactly as no one can doubt that the earth has gotten warmer since we've started measuring its temperature.
That said, my political position is that the risk of it being our fault outweighs the risk to the economy/personal liberty of not reacting to it. I'm going to act as if we've caused it, and seek to limit any impact I might have, because that's what I believe to be the responsible way to behave toward the future. I can't fault people who value unchecked industrial growth, and consider the economic benefits of a higher quality of life right now to be more valuable than a vague threat to the wellbeing of the future. I will try to dissaude/persuade you, because that's how politics works.
But that's a value debate, and is not relevant to belief in global warming. Only nutjobs who are willfully ignorant of the facts of reality disbelieve the phenomenon of global warming--it's akin to saying red is blue. Perfectly rational people disagree about the probability that it's our fault, and disagree over the political/social values at play in responding to the possibility of our responsibility, but that's not related to the phenomenon of global warming itself.
Oh, and if I haven't beaten this dead horse enough, it isn't really global warming we need to worry about, it's global climate destabilization. The record snowfall that's been slamming me and hindering my running is a result of changes to the flow of the North American jet stream because of a general increase in worldwide temperature. Global warming causes record cold and snow too, because it shifts weather patterns. And if there's any chance that my tax dollars supporting green energy technology can help limit the amount of record snowfall I have to run through on my tempos twenty years from now, I'm happy to support legislation aimed at combating climate change.