Make carbon taxes high-viz, or we’ll have our own gilets jaunes

Behavioural taxes work only if they are avoidable, culturally acceptable and obvious

Plastic pollution was a concern for governments almost as long ago as when David Attenborough started to talk about it. Ireland has had a plastic bag tax since 2002 and it has been very successful. Official figures suggest a decrease in usage from an estimated 328 bags per person each year to 14 over a 12-year period.

In the course of that reduction, some eccentric habits have emerged. I know of one woman ...