It’s time for full tranparency about petrol

In 2015 I wrote about a scheme in Canada to add warning labels to petrol pumps – gas pumps, for my American friends. The labels were inspired by the warning labels on cigarette packets, with wording that highlighted the climate impact of the fuel. It’s an interesting idea, connecting people’s ordinary actions with their global consequences, though for a while it didn’t look like it was going to get much further than certain regions of Canada.

That changed this year, when Cambridge, Massa...