Well, I might as well put my feelings about this topic here. On an off-topic tie-in...has anyone here heard of White Wilderness? It's a Disney film that I feel is very similar to the global warming mindset. For those of you who haven't seen it, I'll highlight the reason I'm using it as an example- in the film, the claim is made that lemmings are sometimes found to commit mass suicide. For years no one disputed it; I can still find a few books that cite White Wilderness as the recorded example of how this lemming effect works. Then, the Disney corporation revealed a little tidbit about that film segment...it was faked to add content to the film. In short, they pushed the lemmings straight off a cliff and videotaped it.
Now that I've said that, I hope where I'm coming from is a bit more apparent. Essentially, science has become the hand that pushes us off the cliff, and we the lemming who drowns for the greater design. Everyone asks me the same question when I say this- "but if science is made to create progress, why would they ever want to inflate what you call a non-existent threat?" Simple. The money from grants doesn't grow on a money tree somewhere in Harvard. To get these grants to do the research that we so dutifully believe goes to a greater good of repairing a natural planetary lifestyle one must submit interesting findings. As posters before me have said, they submit a hypothesis. It is through this process that a hypothesis is contorted into a fact, and when the people trust you your facts become theirs.
In a nutshell- the Earth has been around much longer than any of us. No one here seems to understand the near-perfect cycle it upkeeps to maintain our way of life. If the Earth only got slightly closer in planetary distance, we would feel the heat of our nearby star acutely. The Earth has been naturally creating this buildup over the years. 'Greenhouse gases' are hogwash excuses- the amount of hazardous material one volcano can let off is infinitely more massive than the pollutants we accumulate over decades. And yet you don't see our ozone layer scattering to the winds when an eruption occurs. It's the same cycle of decay and rebirth that the Earth goes through all the time to maintain the perfect balance.
There is nothing wrong with the Earth or global warming. It's just that over a few thousand years the Earth has managed to support a race that actually gives a hoot as to what it's been doing since water first splashed onto it's bedrock.