Okay so late into this disscusstion, but here is my two cents.
My father is a retired meteorologist from the US Air Force. He says and has shown me great examples that basically, we can't say what is causing the icecaps to melt. We can't say it's cars or factories or any of the other big pollutions, because we have just plain not be studying it long enough. They just plain have not been recording weather for very long...So how can we say it is human's fault.
For example...last summer tickled me. They had a bit on the news about global warming and how horriblely dry and hot it was. Then the weather came up and it showed that we did not quite beat the old reacord in the 40's. HA! So what happened then? What about the dust bowl of the 30's here in the US and Canada? http://en.wikipedia.org/wiki/Dust_Bowl for those who might not remember this from school. That was a horrific hot dry period in our history. Was it caused by pollution, well no of course not. There was not even as much as there was in the 80s....and yet we had no repeat of a dust bowl then.
And yes...the earth cycles. Hot, temprate, cold, over and over again. Quite frankly the earth is not here for our Pleasure. She is not our submissive to be whipped into serving us best. She will do as she pleases. We are not her prioirty. She will one day kill us like the dinosaurs, like the creatures of the IceAge, and like the first buggies to crawl on her shores. That is her option.
*oooo sorta dips it's toes into my religion really*
So yes, stopping polution and the rape of natural resourses is good, and we need to do it. It's only respectful and right. But will that make a difference...not to the warming of the earth no. We can either adjust as a race, or we can die. I suggest we stop breeding so many mouths to feed, protect and charish what we have, and start being more flexible.