Our cities can still choose their climate future

I have spent the better part of a decade watching the climate debate happen at the wrong altitude. It lives in the rarefied air of summits and national targets, of pledges measured to the decimal point and revised at the next election. And every year I come away from those rooms with the same stubborn conviction: that almost nothing decided in them changes anyone's actual carbon footprint, because the things that do — how you get to work, how warm your flat is in February, whether your street holds heat like a frying pan in July — are not set by a head of state. They are set by a city. And cities, quietly, have started to act.

The arithmetic is on their side. Urban areas concentrate the majority of the world's people, the majority of its energy use and the overwhelming majority of the decisions that a transition actually turns on. A national government can announce a target; it cannot, by decree, insulate ten thousand draughty apartment blocks, lay a bus lane, plant a street of trees or rewrite a zoning code so that people can live within walking distance of their lives. Mayors can. And while the heads of state were softening the language of a deal struck at four in the morning, mid-sized cities across the continent were simply getting on with it.

The unglamorous list that works

The municipal toolkit is not exciting, and that is precisely its strength. Transit that runs often enough to leave the car at home. Deep retrofits that cut a building's heating demand by half before a single heat pump is installed. Density that puts a school, a clinic and a grocer within a fifteen-minute walk. Heat-action plans — cool roofs, shaded corridors, opened pools — that are no longer a luxury but, in a warming summer, a matter of who lives and who does not. None of it makes a stirring speech. All of it works, and it works on a timescale that national politics, addicted to the next ballot, cannot manage.

What gives me genuine, grounded optimism is that the leaders here are not the famous capitals. They are the second cities — the regional hubs of two and three hundred thousand people, nimble enough to repurpose a budget in a single council term and small enough that a mayor can stand in a renovated square and point at the result. These places are not waiting for permission. They are trading playbooks with one another across borders, lifting what worked in one town and dropping it into the next, building a quiet international of competence that runs underneath the noise of national politics.

I am not naïve about the limits. Cities cannot set a carbon price, cannot regulate a national grid, cannot conjure the capital that a full retrofit programme demands; they are perpetually starved of the funding and the legal power that their ambition outruns. The municipal route is not a substitute for national and international action — it is the layer where that action either becomes real or evaporates. A grand pledge that no city is equipped to execute is just a press release with a longer shelf life.

Give them the tools

Which is why the most useful thing higher governments could do is humbler than another target: hand cities the money and the authority to do what they have already proven they can. Let them keep a share of the revenue from the buildings they decarbonise. Give them borrowing powers tied to the emissions they actually cut. Stop forcing a mayor to beg a ministry for permission to plant a forest in a car park. The competence exists; it is the constraints that need lifting.

I have stood on too many retrofitted streets, in too many ordinary cities, to accept the counsel of despair that passes for realism about the climate. The future is not something that gets decided, once, in a distant hall by exhausted negotiators. It gets decided a thousand times over, in council chambers and planning offices and on the streets where most of us actually live. Those decisions are still ours to make. The cities making them are not waiting to be saved. They are, modestly and without applause, getting on with saving themselves — and the rest of us would do well to give them the tools and then get out of the way.