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Where is the proof that humans are causing climate change? Virtually every point "made" in An Inconvenient Truth is easily refuted. An argument of "How could you be so stupid? Everyone with half a brain knows this is true" does not go very far toward convincing people.
The real problem is that scientists have largely thrown their idealistic lot in with the liberal group, since they appeal to the elitist view largely adopted by those who espouse the anthropogenic hypothesis. We then get the elitist eye rolling and tongue clucking, as if the 75% of Americans who still doubt the evidence for the anthropogenic theory are blithering idiots to be led along by those who "really know."
Get off your high horses and present some actual proof of the concept, not arguments like "Everyone knows it's true"!