Angus, your obviously a global warming believer and truth be told I have no problem with that, but I have to ask.
Do you think people can actually do ANYTHING to stop the earth from changing? Marine fossils have been found in the Rocky Mountains, the Alps, they've even found them on Mt. Everest. That's proof that at one time all those places were under water. There is geological evidence in Central Park that proves that at one time a glacier more than a mile thick sat on top of New York City. The planet constantly changes. Sometimes slowly, sometimes in the blink of the eye. Here's an excample, in 1883 the island of Krakatoa vanished in seconds when it exploded, sending ash into the atmosphere that stayed there for years and contributed to cooling the global climate. Evidence of this has been found in ice core samples from around the world. That island is back again and is now called Anak Krakatau and it's erupting all the time. What's going to happen when it blows it's top?
I agree polution is a bad thing and should be reduced whenever possible, BUT, to say that mankind is causing all these changes we see everyday in the enviroment just doesn't make any sense. The entire planet, the land, the oceans, the atmosphere, everything, is ALWAYS in a state of flux, constantly changing, and there is nothing that we can do as a species to stop it. We will either adapt as the planet evolves and changes or we will die as a species like the dinosaurs did.
I just can't support a theory that says people are causing the planet to change, when there is historical evidence of the same changes happening in the past when people couldn't have been the problem. In the great sceme of things, considering how long this planet has been around, and how long it's going to be around, we (you and I) are only living on this rock for a nano second. What can we do in such a short period of time? Nothing. We will not make anything better or worse over the long haul of the planet.