As implementers, city leaders are driven by multilateralism that delivers. We use data to define our goals and work with those who want to set the pace; not wait around for the delayers and wreckers. COPs need to do the same.

What we needed was multiple coalitions of the willing for faster implementation; like the leadership shown by Colombia on the Belém Declaration on the Just Transition Away from Fossil Fuels; and the Action Agenda, which made good progress and should be the focus of COPs going forward.

In part, COP30 failed to adequately move from negotiation to implementation because of a perpetual focus on a lowest common denominator consensus.

Let’s make cities and subnationals part of the success story of #COP30. (7/7)

C40 cities account for 23% of world economy. 75% are reducing per capita emissions quicker than their national govts. 73% of member cities for which we have data have already peaked emissions and are rapidly reducing further. These city wins can be global wins for all - with the right support. (6/7)

Supporting subnational climate delivery is a win-win for national governments - our ambition and implementation on the frontlines of the climate crisis can be part of their success. (5/7)

We need this level of recognition and engagement to help ensure mayors and other subnational leaders can go faster and further in delivering the urgent climate action the world needs. To truly make this the COP of implementation. (4/7)

Our mission now in Belém is to secure a formal space for subnationals and national governments to collaboratively accelerate action. Critically, we want this formally recognised in the COP30 outcome - not just part of a broader action agenda, but at the heart of the negotiated outcome itself. (3/7)

From disarming disinformation on the climate crisis frontlines to raising the ambition on fossil fuel phase out; building global collaboration on annual delivery of on-the-ground climate solutions to ensuring climate action is rooted in the just transition, cities are already leading the way. (2/7)

We were lucky to host many European mayors at #WMS25, part of the Local Leaders Forum, as well as @teresaribera.ec.europa.eu, who made the CHAMP announcement at the Local Climate Action Summit here in Rio today.

Ahead of #COP30, this commitment sends a clear signal: multilevel governance is key to achieving the Paris Agreement goals and securing a fair, liveable future for all.

The climate crisis will only be solved by every level of government working together, and the EU’s backing of the CHAMP coalition will go a long way to bridging the gap between national ambition and local delivery.