Expert-consensus distortion misrepresents how much genuine agreement exists among qualified experts — inflating a fringe position into an apparent split, or dismissing a robust majority by spotlighting a handful of dissenters. It works by hijacking a legitimate and useful heuristic: when we cannot evaluate technical evidence ourselves, we reasonably defer to what most relevant experts conclude. Distortion feeds that heuristic false input about where the weight of evidence actually lies.
The tactic has two mirror-image forms. False consensus claims that “the science is settled” or “everyone agrees” to shut down scrutiny of a contested point. Manufactured doubt does the reverse — insisting “we just don’t know” where strong consensus exists — to delay action, a strategy documented in campaigns from tobacco to climate. Both borrow the authority of “science” while bypassing the thing that makes science authoritative: systematic, transparent weighing of evidence.
Because the surface claim sounds authoritative and few audiences chase down the underlying literature, this is hard to catch in the moment. The defense is to treat consensus as something that must be shown, not merely asserted — traceable to reviews, meta-analyses, or the synthesizing bodies whose role is to summarize a field, and weighed by evidence quality rather than by counting heads or dissenting signatures.