Cities lead the world in climate action as C40 World Mayors Summit 2025 begins in Rio
Rio de Janeiro, Brazil (3 November 2025) – Mayor of London Sadiq Khan and Mayor of Rio de Janeiro Eduardo...
C40 cities on track for 50 million good green jobs by 2030 as mayors deliver on World Mayors Summit job creation pledge
London, UK (28 October 2025) – New data released today shows C40 cities are now home to 21 million good,...
A look back at London Climate Action Week 2025
Turning climate ambition into reality Across the world, cities and their mayors are driving climate solutions forward. At a time...
Statement by C40 Co-Chairs Mayor of London and Mayor of Freetown at the WHO Conference on Air Quality in Cartagena, Colombia
A public statement by C40 Co-Chairs, Mayor of London and the Mayor of Freetown, at the WHO Conference on Air…
Global network of mayors react to President Trump withdrawing the US from the Paris Climate Agreement
President Trump has confirmed that he will once again withdraw the United States from the Paris Climate Agreement in his...
C40 Cities: 2024 In Focus
2024 brought challenges for global climate action, but cities around the world continued to lead the way with creativity and…