People are not good at seeing the future, particularly the future of people. The problem is that people are changeable, they don’t always do in the future what they do now. People, being people, know this – or should – but often carry on regardless.
Total population change in a country comprises three elements: migration, lifespan and fertility. In no case have people done what they were meant to. The numbers came out and then, drat them, people had the nerve to live even longer, just like that. [link]
While we are familiar with the concept of the demographic transition, Britishers in the 1960s apparently weren’t. Take a look at the actual number of births along with some forecasts from the past.
Sir David is a member of the Optimum Population Trust, a group that advocates population control by killing everyone whose household income is in the lowest quintile. I’m joking of course – that would be a version of a modern day Malthus. The OPT actually asks for voluntarily limiting births, and a few other humane options for limiting population growth, to allow for the protection of wildlife and nature.