Definition
Chemophobia is an aversion to synthetic chemicals that is disproportionate to the dose-and-exposure evidence — typically driven by the words "chemical," "synthetic," or "artificial" rather than by any actual measurement of harm.
Rosling uses it as a textbook case of the Fear Instinct misfiring. Trace pesticide residues, for example, can trigger more public alarm than naturally occurring carcinogens that are present in far higher concentrations in the same diet. The fear tracks framing, not toxicology.
Why it matters
How it works
The Fear Instinct evolved to flag invisible, contaminating threats. A clean glass of water with an unfamiliar additive feels worse than a dirty meal cooked over an open fire, even when the second is statistically more dangerous. Synthetic chemistry is invisible, novel, and named with intimidating Latin or numbered identifiers — perfect raw material for the instinct to grab onto.
Two amplifiers convert the instinct into a movement. Media coverage favors any story that links a household product to a scary disease, no matter how thin the dose-response evidence. Advocacy and marketing then build entire categories — "clean," "natural," "free-from" — that monetize the fear without rebutting it.
The correction is not to dismiss chemical risk; some exposures genuinely matter. It is to do the arithmetic. What is the dose? What is the established exposure threshold? What are the comparable risks the same person tolerates without thinking — driving, alcohol, sunlight, woodsmoke from a "natural" fire? Once the numbers are on the page, the relative scale almost always rearranges priorities.