Its happened to us all. You’re walking along quietly, suddenly a bus/truck accelerates, you jump, inhale and then cough out the diesel fumes. Really bad for your health; stunts children’s brains, worsens asthma... Stark contrast with the fresh, sweet, sometimes salty coastal air I’m breathing on this walk. But it doesn’t need to be like this; nothing is immutable.

For those of us brought up in the 1970s/1980s, we could never have imagined a world without cigarette smoke everywhere. And yet, within 20 years, smoking went from cool to sad. Legislation helped, yes, but social mores changed.

Back to diesel fumes. Battery prices are plummeting. Within 10(?) years most new buses/trucks will be electric – faster if society signals that air pollution is no longer acceptable. One day a child will ask: what’s that funny smell? Well, you’ll say, there was this stuff called diesel…

Each of us can nudge social mores along. And end up healthier.