There is an absolutely serious hypothesis that the sharp drop in violent crime in the USA since the early 1990s is due to the EPA and, in particular, to the shift from leaded to unleaded gasoline roughly two decades earlier. Kevin Drum notes that James Q. Wilson ascribes about half of the total decline to lead exposure. The hypothesis makes sense, lead poisoning too mild to cause other symptoms is very strongly correlated across individuals with violent behavior. The hypothesis ... Read more
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