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POPSHow to Talk to a Global Warming Skeptic (FAQ) More common questions and myths answered at the source, thoroughly cross-referenced and conveniently categorized and sub-categorized by type of argument: Stages of Denial Scientific Topics Types of Argument Levels of Sophistication A nice reference that's updated with fresh comments. Many "skeptics" often are unaware (by choice or by circumstance) that their common questions have already been addressed by scientists long ago.