http://climate.nasa.gov/causes
What we need is a new way of doing things. A handful of people not driving cars anymore will do nothing. Its going to take a total and complete change in the way we use transportation and heat our homes. Not to mention regulating industries that pollute the air.
Most of the people I know that understand the climate change and how its effecting earth and why it is happening also push for better technology in cars, energy and industrial pollutants. Those that are determined to stay stuck in the past and refuse to move forward with progress usually say something stupid like "well if you believe then why don't you stop driving your car?".