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...
The Ramboll Foundation announces strategic partnership with C40 Cities
C40 Cities and the Ramboll Foundation, together with experts from Ramboll, aim to accelerate urban resilience and put community wellbeing...
20 Years of C40 Cities: Local Leadership Driving Global Climate Action
From London in 2005 to 97 of the world’s largest cities in 2025, C40 Cities marks two decades of unwavering...
C40 World Mayors Summit to be held in Rio de Janeiro on the eve of COP30
London and Rio de Janeiro (June 24 2025) – The Mayor of London and Co-Chair of C40 Cities Sadiq Khan...
Mayors from C40 cities around the world arrive in London for Europe’s largest city-wide climate festival
London, UK (23 June 2025) – Mayors from across the C40 network, representing cities on five continents, have arrived in...
C40 2024 Annual Report: How cities are building fairer, safer and greener communities
C40's 2024 annual report is here. Read the foreword written by co-chairs Mayor of London Sadiq Khan and Mayor of…