Population

For anyone tempted to try to predict humanity’s future, Paul Ehrlich’s 1968 book The Population Bomb is a cautionary tale. Feeding on the then popular Malthusian belief that the world was doomed by high birth rates, Ehrlich predicted: ‘In the 1970s hundreds of millions of people will starve to death.’ He came up with drastic solutions, including adding chemicals to drinking water to sterilise the population. Ehrlich, like many others, got it wrong. What he needed to worry about was declining birth rates and population collapse. Nearly 60 years on, many predict the world will soon reproduce at less than the replacement rate. But by my calculations, we’re already there.

Within limits Do 20mph speed limits save lives? – A 2018 report by Atkins/AECOM/UCL found that 51% of motorists conformed to the new limit (47% in residential areas and 65% in city centres). – When a 20mph zone replaced a 30mph one the median speed fell by 0.7mph in residential areas and 0.9mph in city centres. It was found that there was insufficient evidence to judge whether the 20mph limit reduced casualties: while accident rates had tended to fall within the zones, the same was true of comparator zones which had remained at 30mph. – Only one area of 20mph zones (in Brighton) had seen a significant fall in casualties

Well, we’ve been terrifically amused and amusing at the expense of Pope Francis, who this week declared at a Vatican audience that: ‘Many couples do not have children because they don’t want them, or have just one because they don’t want any more, but have two dogs, two cats… oh yes, dogs and cats take the place of children.’ It was, he said, proof of a ‘certain selfishness… it makes us laugh but it’s true. Renouncing parenthood diminishes us. It takes away our humanity.’ This was inevitably cue for British commentators to weigh up the merits of cats and dogs versus children, and for some to pronounce in favour of