Read the foreword for the C40 Cities Annual Report 2025, written by the C40 Co-Chairs, Mayor of London Sadiq Khan and Mayor of Freetown Yvonne Aki-Sawyerr The C40 Steering Committee meeting takes ...
C40 is proud to announce the winning projects of this year’s global youth design challenge Youth Reinventing Cities (formerly ...
Through the C40 Cool Cities Accelerator, mayors showed how fast-moving local action saves lives: Building on a successful pilot, New York City has secured $350,000 to roll out its cooling pop-ups for ...
US cities now make up nearly half the endorsers (22 out of 49 cities) of the Global Urban Data Centres Pact, a mayor-led initiative, co-founded by Mayor Kate Gallego of Phoenix and Melbourne’s Lord ...
Nearly 1 billion people live in C40 cities. Mayors see firsthand the challenges people face and the solutions that ...
New York U20 concludes with calls for greater powers, finance and partnerships for cities to deliver on housing, climate ...
New York, USA (19 September 2026) – Mayor Zohran Mamdani will welcome mayors from across the United States and around the world to New York this weekend, as city leaders unite for practical action on ...
The City of Phoenix, C40 Cities and WSP invite public feedback on a draft plan to expand reliable, driver-centered ...
The Journal of City Climate Policy and Economy (JCCPE) publishes timely, evidence-based research that contributes to the urban climate agenda and supports governmental policy towards an equitable and ...
London, UK (23 June 2026) – Data centres, the infrastructure powering the global digital economy, are being built in cities worldwide at unprecedented speed. In many cases, residents fear that this ...
Around the world, C40 cities are driving bold solutions to the climate crisis. As part of the C40 World Mayors Summit 2025, Mayors share how they’re transforming their cities, from cutting emissions ...
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