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...
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...
Urban 20 in Review: Lessons for the road ahead
Co-chaired by Tshwane and Johannesburg, the Urban 20 (U20) Sherpa Meeting brought city leaders together to advance bold climate action.
Empowering social housing tenants in Oslo
In the face of the Oslo housing crisis, tenants and councils are working together to reshape social housing that is…
Madrid: Taking clean construction action – lessons from C40’s VISIBLE project
C40 Cities gathered stakeholders in Madrid as part of the VISIBLE project, empowering European cities to green their construction sectors.
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…