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hazard is more ‘dread’ if it is uncontrollable, involuntary, fatal, inequitable and increases risk to future generations – think nuclear accidents. A potential threat is more ‘unknown’ if it is unobservable, novel, and ill-understood – think attitudes to electromagnetic radiation from mobile-phone masts. Familiar activities like cycling, while potentially risky, are neither unknown nor dread.
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David Spiegelhalter (The Art of Uncertainty: How to Navigate Chance, Ignorance, Risk and Luck)