Ah 'tis my subject. I've done a bit of research in this for some projects of mine for school. I got to talk with some former professor at Harvard about it, but I can't quote stuff because I don't remember the exact words so bear with me. =)
Moolkye, on May 9 2006, 02:08 PM, said:
I think Global warming has been around longer than we have. I do not think there is a problem, just a cycle. I believe that this will all come around full circle eventually.
Yes the stuff we have today does effect it, but I do not believe that. If so, than our time here with the pollutants that we put into the air, are nothign compared to what has been put into it from the past such as volcanic ash and other celestial disruptions.
There most certainly is a cycle. If we allow it to continue by not stopping our greenhouse gas releasing, it will result in the human race (and other species) becoming extinct (eventually... talking 100-200 years or so), or at least some chaos because we'll run out of oil eventually as well. Whichever happens, right after there will be an immediate decrease of the amount of CO2 being released, and thus the temperatures will cool down again. I'm not sure if the cycle will start up again and have life form after that, though... =p
Cerebral Stasis, on May 9 2006, 08:51 PM, said:
It's been found that the largest producer of greenhouse gasses are plants, themselves, so apparently the enviroment manages to balance things out one way or another.
I'd love to see some evidence of that. Can you explain the amazing increase in the amount of CO2 in the atmosphere recently? It is a huge difference, and I don't see how anyone can say that it naturally occurred. Here's a graph of it I found online, though I cannot guarantee its validity, I doubt that it is inaccurate.

As you can see, it was previously going up and down, but staying at a somewhat constant amount. Until about 1900.