How 96 cities represent 23 percent of the global economy
In short: While national governments often hold the headlines on climate policy, the real heavy lifting happens in urban centers. C40 Cities is a powerhouse network where local leaders coordinate to slash emissions, proving that city-level action is a primary engine for global economic and environmental stability.
Founded in October 2005 by London Mayor Ken Livingstone, C40 began as a coalition of 18 megacities. It quickly evolved through a 2006 merger with the Clinton Climate Initiative, led by former U.S. President Bill Clinton. This partnership expanded the network to 40 cities and introduced professional project management to help members deliver measurable emissions reductions. Since then, the group has grown to 96 member cities across seven geographic regions.
The organization operates on a sophisticated governance model. It is led by a rotating steering committee of mayors from diverse global hubs, including Tokyo, Seoul, and Nairobi. This structure allows for peer-to-peer knowledge sharing and direct technical assistance. While it originally focused on megacities, C40 now uses three membership categories—Megacity, Innovator City, and Observer—to include a broader range of urban leaders based on population size, GDP, and environmental leadership.
C40's influence is underscored by its scale: its members represent more than 10 percent of the world's population. The group serves as a bridge between local action and international policy, advocating for national governments to provide cities with greater autonomy. By convening networks for research and green financing, C40 positions urban centers not just as victims of climate change, but as the primary architects of a sustainable global economy.
The organization's history is marked by key leadership milestones, from David Miller’s 2009 summits in Copenhagen and Seoul to Michael Bloomberg’s tenure (2010–2013), which established uniform benchmarks for success. More recently, under the leadership of Sadiq Khan and Anne Hidalgo, the group has pivoted toward securing green financing and recognizing women's leadership in climate action.
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Sources
- Summary by Intellect · source: C40 Cities Climate Leadership Group
- Also: find-and-update.company-information.service.gov.uk — C40 CITIES CLIMATE LEADERSHIP UK overview - Find and update company information - GOV.UK
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