Today, Extinction Rebellion and the climate strike movement haven’t quite embraced the population’s contribution to the crisis. Other high-profile population awareness organisations are working hard to be acceptable, so suggest zero or one offspring, and still say stop at two. Two is too many: computer models suggest even one-child families would result in 5-10 billion people by 2100.

Although the basic concept of the movement is the same, my motivations have evolved. I was a deep ecologist at first, caring more about our impact on the ecosphere than human needs. I’ve become more concerned about any new humans being brought into existence. Procreation today is the moral equivalent of selling berths on a sinking ship.

It’s true that society would be greatly diminished without children, but it isn’t right to create them just because we like having them around. People worry that we won’t have enough workers to support pensioners, but economic systems are artificial and can be adjusted. We don’t need to breed more wage slaves to prop up an obsolete system. If we go extinct, other species will have a chance to recover. I’ll never see the day when there are no humans on the planet, but I can imagine what a magnificent world it would be – provided we go soon enough.