First, cast doubt on the science. Second, question the personal motives and integrity of the scientists. Third, magnify genuine disagreements among scientists, and cite nonexperts with minority opinions as authorities. Fourth, exaggerate the potential harm caused by the issue at hand. Fifth, frame issues as a threat to personal freedom. And sixth, claim that acceptance would repudiate a key philosophy, religious belief, or practice of a group.
Six tactics used by denial campaign. Keep them in mind so that you’ll be able to distinguish denial from legitimate scientific debate. – Flavors of Uncertainty: The Difference between Denial and Debate (via scipsy)