Why the Right to Housing is the Key to Climate Survival
The profit paradox: reclaiming housing as a human right The climate and housing crises are making homes less safe, less...
UN Secretary-General receives local leaders’ joint outcome statement during COP30 World Leaders Summit
The statement is the final outcome from the Local Leaders Forum in Rio de Janeiro – a declaration of support...
Global Methane Hub Announces $10 Million Investment to Accelerate Methane Reduction in Latin American and Caribbean Cities
Rio de Janeiro (November 4, 2025) – Today, at the 2025 C40 World Mayors Summit (WMS), building on the success...
World Mayors Summit Day 1
The World Mayors Summit 2025 opened with a powerful plenary as the Mayors of London, Freetown, and Rio de Janeiro...
There’s something new on climate coming out of China
Mark Watts, Executive Director of C40, explores why China's "irreversible" green transition and growing global ambition are offering a new…
Building healthy, thriving cities: A conversation between C40 and Novo Nordisk
Next week, from 3-5 November, leaders from around the world will gather in Rio de Janeiro for the C40 World...