Global warming is not about whether you are liberal or conservative or what you envision as the role of government. It's not about whether you prefer to live simply or luxuriously or what connotations the words capitalism or consumerism have for you.
Global warming isn't even about whether you like or dislike Al Gore. As difficult as this may be for many Americans to understand, it's not actually about Gore at all.
The issue of global warming is about the answer to the question: “What is the evidence for what is happening to the planet?”
People believe it's about other things because, as author Will Durant said, we think with our hopes and fears and wishes instead of with our minds.
The Scientific Guide to Global Warming Skepticism provides an excellent summary of the lines of evidence that have led science academies throughout the world, including the Academy of Science of South Africa, to conclude that climate change is human caused. It's available online.
Closely examining the best available evidence is essential for developing an informed position and for assuring that one isn't simply ideologically committed to attacking (or defending) climate science.