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 ...

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 ...

Yearly offer of action - C40 Cities Yearly offer of action ...

As New York Climate Week comes to a close, one message stood out above the rest: mayors aren’t waiting for the future. They’re acting now. Across energy, housing, extreme weather and resilience, city ...

The city of Milan developed an integrated waste collection plan to recycle the largest possible portion of material, including organic waste, since 2012 xxi. Milan ranks very high among European ...

Extreme heat is the deadliest weather-related disaster, contributing to an estimated 489,000 deaths [1] around the world each year. By 2050, the number of city dwellers facing dangerous temperatures ...

How can we build our future cities today, without costing the earth tomorrow? Transforming Cities is a series produced for C40 by BBC StoryWorks that illustrates climate solutions through the ...

Nearly 1 billion people live in C40 cities. Mayors see firsthand the challenges people face and the solutions that ...