Richie..."Definitive proof" of the cause of something as complex as global warming is something hard to get, or even recognize when you see it. It's something like trying to prove that smoking causes cancer. I doubt that, even now, the tobacco companies are willing to accept that there is "definitive proof" that it does. But, the preponderance of the evidence says that it does, so I choose not to smoke. With respect to global warming, the predictions of studies based on some pretty good science say it is likely to happen and measurements of things like air temperature and glacier ice thickness confirm it. Take a look at the subject "Global Warming" in Wikipedia and you'll see some clear trends.
The debate that continues today is largely political, with those who have a vested interest in continuing to depend on oil and coal continuing to fight attempts to redirect resources to clean energy sources. They have succeeded in delaying a significant effort in the US.
Incidentally, I think there still is a Flat Earth Society that denies that the world is round.
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