It wasn’t that long ago when the fashionable gathering place for young couples was a meeting of the National Childbirth Trust. I remember, in the early months of 1995, sitting in our instructor’s front room as she passed around a plastic model of a female pelvis while she asked us: ‘So how do you think the baby gets out?’

Fast-forward three decades and there is a new way for middle-class would-be mothers to spend their evenings: attending sessions of a project entitled ‘Motherhood in a Climate Crisis’ put on by the University of Bristol’s Brigstow Institute.