This story came about on my second day in Cali, Colombia, as I scrambled to find stories at my first UN summit on biodiversity. Late morning, I stopped in the large plenary hall where I knew there was a daylong session on the role of cities and states — subnational entities — in conservation and climate action.

By luck, I entered as one of the panelists was talking about the work that had been accomplished in his city of Vancouver, British Columbia, Canada. I asked an event organizer who was speaking and she told me: Gregor Robertson. I looked him up on my phone, and up came a long list of impressive credentials as a former mayor and current leader of two large subnational coalitions on the issues being discussed from the stage. I waited until the panel concluded, introduced myself to Robertson and asked if he had time for an interview.

My idea at the time is what became this story: a Mongabay Q&A. Late afternoon, Robertson joined me in the media center where I was set up and answered my questions for about 45 minutes. His enthusiasm for the role that subnational entities are already playing in climate action and conservation was immediately evident. So was his frustration with the lack of action by national governments who control much of the finances that enables these urgent local efforts to take place.

The interview became, as my editor Glenn Scherer wrote to me after he completed his edits, “The first really sensible, and doable climate solution story I’ve read in awhile.” The story was published just as another UN climate summit, COP29, was wrapping up in a corrupt petrostate and predictably, failing once again to meet the urgency of the moment in this ongoing climate crisis.