Mayor of London pledges international support to help Sarajevo tackle life-threatening air pollution
The Mayor of London and Co-Chair of C40 Cities, Sadiq Khan, met with the mayor of Sarajevo and the Prime...
The Yearly Offer of Action 2025
To deliver the Decade of Acceleration called for by the United Nations Secretary General, decision-makers need to act now, not…
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…
What happened at the U20 Summit in Rio?
What demands do mayors have for national leaders at the G20 Summit and COP29, following a successful U20?
C40 Cities Finance Facility announces call for cities to apply for award-winning climate action support
The C40 Cities Finance Facility (CFF) is excited to announce its latest ‘Call for City Applications’ to advance climate action…
Mayors call for global leaders to partner with cities on climate as new poll shows Brazilians support city-led response
More than 70 mayors and city leaders from around the world will arrive in Rio de Janeiro this week for...