Those are some awfully big presumptions you're making. I think all of this has more to do with the earth's natural cycle of warming and cooling to do with "global warming"--because as George Carlin once pointed out, how can something that we've been doing for less than 200 years irrevocably screw up the earth worse than anything that's happened to it in the past 4,000,000,000 years it's existed?
That being said, I don't think we should do nothing about pollution and waste. To just ignore it would just be a long, drawn-out process of shooting ourselves in the foot. Of course we need to wean ourselves off of fossil fuels, of course we need to find more efficient ways to deal with waste, and of course we need to make sure we don't cut down every forest left on the planet. Nobody is arguing all of those things are fine and dandy as they are and could never come back to haunt us someday.
What they argue is that we don't need to flip everything upside down this very moment to deal with those problems. We need to let the improving technology run its course and work society into a position to where it is ready for those things when they arrive [sub](and when the oil companies decide they can't hold it back any longer).[/sub]
At this point, the notion of global warming feels like little more than a fad to me. It's worn out. It's just a buzz word, like "abortion" or "gay rights." I think if you want to convince people to be more green, you should stop beating them over the head with videos of stranded polar bears trying to swim for the shore 10,000 miles away, and present the problem as a local issue. You know, on a more human level. Show the long-term affects pollution can have on people and where they live.