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Accumulated research findings show that women tend to express higher levels of concern toward technology and the environment than do men, but that the tendency is not universal. The findings are particularly clear-cut for local facilities and/or nuclear and other technologies that are often seen as posing nisks of contamination; findings appear to be more mixed for broader patterns of environmental concern. Although the differing patterns have been reported with enough consistency to be considered relatively robust, less progress has been made to date in explaining the underlying dynamics. Five main hypotheses can be identified. One hypothesis, the expectation that increased knowledge will lead to decreased concern, has received so little support, despite repeated examination, that it can be discarded. Another, that women tend to express greater concern than do men about the health and safety implications of any given level of technological risk, has received consistent support. The remaining 3 hypotheses require additional empincal examination.

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At least since the time of Popper, scientists have understood that science provides falsification, but not “proof.” In the world of environmental and technological controversies, however, many observers continue to call precisely for “proof,” often under the guise of “scientific certainty.” Closer examination of real‐world disputes suggests that such calls may reflect not just a fundamental misunderstanding of the nature of science, but a clever and surprisingly effective political‐economic tactic—“Scientific Certainty” Argumentation Methods, or SCAMs. Given that most scientific findings are inherently probabilistic and ambiguous, if agencies can be prevented from imposing any regulations until they are unambiguously “justified,” most regulations can be defeated or postponed, often for decades, allowing profitable but potentially risky activities to continue unabated. An exploratory examination of previously documented controversies suggests that SCAMs are more widespread than has been recognized in the past, and that they deserve greater attention in the future.

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