I tend not to respond to these sorts of arguments, but I can stay silent only so long in the face of some of the uninformed opinions being bandied about here.
Joseph – your second post begins with the admission that you know very little about the Montreal Protocol, but then you spend a couple paragraphs criticizing it and linking it's effects to the general demise of the great American way of life. To me, this is indicative of your generally misinformed, yet highly opinionated view of the world.
Do you really think that all of the scientists around the world working on the issue of climate change are part of some massive conspiracy to subject the world to an oppressive totalitarian regime? Perhaps a more reasonable line of reasoning is that they simple care about our future on this planet and are doing their best to understand a small subset of the impacts our existence has on the life-support systems of the Earth. As for real evidence, kindly read through this document:
http://www.ipcc.ch/publications_and_data/ar4/syr/en/contents.html
It is the latest complete report from the Intergovernmental Panel on Climate Change that details the combined findings of more than 2000 scientists on various subjects related to climate change. Of particular interest to you will be the section "Summary for Policymakers" and the sub-sections "Observed changes in climate and their effects" and "Causes of Change". These state that warming of the global climate is unequivocal, and that this warming is having noticeable effects on global systems. It also states that it is "very likely" that most of the observed warming is due to anthropogenic effects.
The fact that the planet is warming is true. Human activities are the likely cause of this change. However, neither of these two facts mean that we should create mass hysteria, eliminate cars, and roll the clock back 10,000 years of human history. They are simply factors that we must consider when we make decisions. The reality is that simply existing on this planet means having an "impact" on the environment. Of course, the Earth has considerable capacity to absorb such impacts and maintain an relatively stable equilibrium capable of maintaining life. That capacity, however, is limited. Nations around the world are continuing to develop and this planet cannot support a population of 7-9 billion people living like Western people do today. Somewhere, something will have to give.
Therein lies the crux of this whole argument – how can we provide the most welfare to the greatest number of people? You could say screw everyone else, I'm not changing how I live just so some African living in a mud hut in a jungle can have electricity. That is a personal choice. I however, happen to believe that everyone born on this planet should have some chance at a fulfilling life. That belief might include giving up some of the material junk that provides me with little or no benefit to my overall well-bring and life satisfaction and conferring it to someone to whom a intact set of clothes and a pair of shoes would change their life. Basically, what I am saying is that the most important point to all of this environmental stuff is promoting a transparent understanding of the true impacts of our actions on both the natural world and our fellow humans. Given that understanding, how you then choose to act is up to you.