T here is a scene in James Redford’s new film, Resilience , in which a paediatrician cites a parental misdeed so outmoded as to seem bizarre. “Parents used to smoke in the car with kids in the back and the windows rolled up,” she says, incredulous. How long ago those days now seem; how wise today’s parents are to the dangers of those toxins. Yet every week in her clinic in the Bayview-Hunters Point area of San Francisco, children present with symptoms of a new pollutant – one that is just as...