But when radicals are arguing for the government to take over nearly every aspect of our lives in the name of controlling the 'carbon foot print' of each individual, I think a much higher standard of evidence is required than mere coinciding factors.
I think there is a definate possibility that our CO2 has or will affect the global climate. Taking small measures now will certainly be easier than drastic measures we may need to take if global warming continues (man-made or not).
The car I drive today uses much less gas than the one I first owned. I don't feel my lifestyle has been adversly affected. Encouraging the conserving of energy is a reasonable step. Switching from carbon power generation to nuclear power generation is a better long-term solution than extracting every last hydrocarbon.
Like health insurance, it is cheaper to buy it now when you're healthy rather than wait until you're diagnosed with cancer.